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UNITED STATES DISTRICT COURT WESTERN DISTRICT OF WASHINGTON SEATTLE DIVISION

EXPERT REPORT OF DR. PRIYA RAMANATHAN ON MARKET DEFINITION AND COMPETITIVE EFFECTS

Filed on Behalf of Defendants Cascade Retail Holdings Inc. and Pinnacle Market Group Inc.

August 18, 2025

Prepared by:

Dr. Priya Ramanathan Managing Director Brindoval Analytics LLC 1700 Pennsylvania Avenue NW, Suite 550 Washington, D.C. 20006

Counsel of Record:

Howard Bellamy Elaine Forsythe Calderwood & Harkness LLP 1401 K Street NW, Suite 1200 Washington, D.C. 20005

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I. INTRODUCTION AND SUMMARY OF OPINIONS

A. Identity and Qualifications of Expert

1. My name is Priya Ramanathan. I am a Managing Director of Brindoval Analytics LLC, an economic consulting firm located at 1700 Pennsylvania Avenue NW, Suite 550, Washington, D.C. 20006. I hold a Ph.D. in Economics from Stanford University, where my doctoral research focused on industrial organization, competition policy, and the economics of multi-sided platforms. My full curriculum vitae is attached as Exhibit B to this report.

2. I have over twenty years of professional experience in the fields of industrial organization economics, antitrust analysis, and competition policy. Throughout my career, I have advised clients, government agencies, and courts on matters involving market definition, competitive effects analysis, merger review, and the economics of platform competition. I have been retained as an expert economist in numerous matters before federal district courts, the Federal Trade Commission, and the United States Department of Justice Antitrust Division. I have testified at trial, at evidentiary hearings, and by deposition on multiple occasions. A complete list of cases in which I have testified as an expert within the preceding four years is set forth in Exhibit B.

3. Prior to founding Brindoval Analytics, I served as a Senior Economist at the Bureau of Economics of the Federal Trade Commission and as an Associate Professor of Economics at Georgetown University. I have published extensively in peer-reviewed economics journals, including the American Economic Review, the Journal of Industrial Economics, the RAND Journal of Economics, and the Journal of Law and Economics. My publications address topics directly relevant to the matters at issue in this case, including multi-sided platform economics, indirect network effects, merger simulation in differentiated product markets, and the competitive dynamics of digital marketplaces.

4. Dr. Lucas Engström, a Senior Economist at Brindoval Analytics, assisted me in the preparation of this report. Dr. Engström holds a Ph.D. in Economics from the Massachusetts Institute of Technology and has extensive experience in empirical industrial organization and econometric analysis. The analysis in this report, including all econometric modeling, data analysis, and the conclusions drawn therefrom, reflects my own independent professional judgment.

5. I have been retained by Calderwood & Harkness LLP on behalf of Defendants Cascade Retail Holdings Inc. ("Cascade") and Pinnacle Market Group Inc. ("Pinnacle") to provide expert economic analysis and testimony in this matter. My retention agreement is dated July 2, 2025. I am being compensated at a flat fee of $1,800,000 through the preliminary injunction hearing, plus reimbursement of reasonable expenses. My compensation is not contingent on the substance of my opinions, the outcome of this litigation, or the consummation of the proposed transaction.

B. Assignment

6. I have been asked to evaluate the following issues in this proceeding:

(1) the proper definition of the relevant product and geographic markets for purposes of analyzing the competitive effects of Cascade's proposed acquisition of Pinnacle;

(2) the likely competitive effects of the proposed acquisition, including whether the transaction is likely to substantially lessen competition in any properly defined relevant market;

(3) whether claimed merger-specific efficiencies are cognizable and verifiable; and

(4) whether Pinnacle's competitive trajectory affects the competitive significance of the transaction.

7. The transaction at issue is an all-cash acquisition by Cascade of 100% of the outstanding common stock of Pinnacle Market Group Inc. for aggregate merger consideration of approximately $4.7 billion, or $26.85 per share. The transaction was publicly announced on March 17, 2025, and is structured as a reverse triangular merger in which CRH Merger Sub Inc., a wholly owned subsidiary of Cascade, will merge with and into Pinnacle, with Pinnacle surviving as a wholly owned subsidiary of Cascade.

C. Summary of Opinions

8. Based on my review of the extensive factual record in this case, my independent economic analysis, and my experience as an economist specializing in competition policy and platform economics, I have reached the following opinions, each of which is discussed in detail in the body of this report:

Opinion 1: The FTC's proposed relevant market is artificially narrow and fails standard economic tests. The Federal Trade Commission's proposed relevant product market — "online marketplace platform services for third-party sellers in the United States" — is artificially narrow, excludes significant competitive constraints that discipline the behavior of marketplace platforms, and fails standard SSNIP analysis. The proper relevant product market is "all e-commerce retail in the United States," which appropriately accounts for pervasive demand-side and supply-side substitution between marketplace platforms, direct-to-consumer e-commerce, social commerce, and hybrid retail models.

Opinion 2: Market shares under the properly defined market are far below any presumptive threshold of competitive concern. Under the properly defined relevant product market of "all e-commerce retail in the United States," the combined entity's share of total U.S. e-commerce gross merchandise value ("GMV") is approximately 7.3%, well below any presumptive threshold of competitive concern recognized in the Horizontal Merger Guidelines or in the case law. Even under the FTC's narrow market, the Herfindahl-Hirschman Index ("HHI") figures do not support a presumption of anticompetitive effects when properly contextualized within the competitive dynamics of the digital marketplace sector.

Opinion 3: The FTC's HHI calculations are artifacts of an improperly defined market. The FTC's HHI calculations — pre-merger HHI of 2,361, post-merger HHI of 2,856, and a delta of 495 — are the direct product of an improperly gerrymandered market definition. They overstate the transaction's competitive significance and do not reflect genuine competitive conditions in the broader e-commerce marketplace in which these firms operate.

Opinion 4: The merger will generate substantial verifiable, merger-specific efficiencies. The proposed transaction will generate verifiable, merger-specific efficiencies of approximately $340 million annually by Year 3 post-closing. These efficiencies include approximately $195 million in logistics and fulfillment cost savings resulting from the integration of Pinnacle's approximately 185,000 active sellers into Cascade's 22-warehouse nationwide fulfillment network, and approximately $145 million in technology and platform synergies resulting from the consolidation of duplicative infrastructure and the integration of complementary technology assets. These efficiencies are not achievable through less anticompetitive alternatives.

Opinion 5: Pinnacle's weakening competitive position materially reduces the anticompetitive potential of the transaction. Pinnacle is a weakening competitor whose GMV growth has decelerated from 28% year-over-year ("YoY") in 2022 to 9% YoY in 2024, and whose seller churn rate has nearly doubled from 12% in 2022 to 21% in 2024. Pinnacle's deteriorating competitive trajectory materially reduces the competitive significance of its elimination as an independent competitor and substantially diminishes any anticompetitive potential of the transaction.

Opinion 6: Low barriers to entry and recent entry provide additional competitive constraints. Entry and expansion by new marketplace platforms — including Brevity Social Commerce Inc. (launched 2023) and Trove Marketplace Inc. (launched 2024) — and by social commerce and direct-to-consumer aggregators demonstrate low barriers to entry and provide additional competitive constraints that would discipline any attempt by the merged entity to exercise market power. Expansion by existing competitors, including Vertex Commerce Inc. and Nomad Shops LLC, provides further competitive discipline.

D. Materials Reviewed

9. In forming my opinions, I have reviewed an extensive body of materials, including court filings, transaction documents, SEC filings, HSR filing materials, Second Request documents, financial advisor presentations, internal business documents of both Cascade and Pinnacle produced in discovery, industry reports, academic literature on marketplace economics and two-sided platforms, the expert report of the FTC's expert, Dr. Wallace Keenan of Thornfield Research Group, depositions and declarations of fact witnesses, and public information regarding market participants and recent entrants. A complete list of all materials I reviewed in preparing this report is set forth in Exhibit A.

10. I reserve the right to supplement or amend the opinions set forth in this report based on additional information, discovery, or analysis that may become available after the date of this report, including any rebuttal materials submitted by the FTC's expert.

II. BACKGROUND ON THE TRANSACTION AND THE PARTIES

A. Cascade Retail Holdings Inc.

11. Cascade Retail Holdings Inc. ("Cascade") is a Delaware corporation headquartered at 2200 Westlake Avenue North, Suite 3400, Seattle, Washington 98109. Cascade's common stock is listed on the Nasdaq Global Select Market under the ticker symbol "CSRT." As of June 27, 2025, Cascade's market capitalization was approximately $41.2 billion.

12. Cascade was founded in 2003 as a diversified omnichannel retail business. Over the past two decades, Cascade has built a substantial retail enterprise encompassing both physical and digital channels. As of the end of its fiscal year 2024 (ending January 31, 2025), Cascade operated approximately 340 brick-and-mortar retail locations across 38 states, serving a broad consumer base with a wide array of product categories including home goods, electronics, apparel, sporting goods, and general merchandise.

13. In addition to its physical store footprint, Cascade operates a significant direct-to-consumer e-commerce platform, CascadeDirect.com, which has been a core component of Cascade's retail strategy since the mid-2000s. CascadeDirect.com offers consumers the ability to purchase Cascade's own branded and private-label merchandise, as well as products from selected brand partners, directly through Cascade's website and mobile application.

14. Recognizing the growth of the marketplace model in e-commerce, Cascade launched CascadeMarket, a third-party seller marketplace platform, on June 1, 2019. CascadeMarket enables independent sellers to list and sell their products through the Cascade platform, with Cascade providing marketplace infrastructure services including payment processing, search and discovery tools, advertising capabilities, and optional fulfillment services through Cascade's logistics network. CascadeMarket was conceived and developed as a strategic extension of Cascade's existing e-commerce platform, leveraging Cascade's established consumer base, technology infrastructure, and fulfillment capabilities.

15. For fiscal year 2024 (ending January 31, 2025), Cascade reported total revenue of $28.6 billion across all segments. The combined revenue attributable to Cascade's e-commerce and marketplace segments was $9.3 billion. CascadeMarket specifically generated $3.1 billion in GMV through approximately 42,000 active third-party sellers and produced $527 million in marketplace services revenue, reflecting an average take rate of approximately 17% ($527 million / $3.1 billion GMV ≈ 17.0%).

16. Cascade's logistics infrastructure consists of a nationwide fulfillment network of 22 warehouses strategically located across the continental United States. This network enables Cascade to offer competitive delivery speeds and cost-efficient fulfillment to both its direct-to-consumer e-commerce operations and its CascadeMarket sellers. The breadth and scale of this fulfillment network is a critical competitive asset that differentiates Cascade from many online marketplace platforms, which lack integrated fulfillment capabilities.

17. Cascade's total e-commerce GMV — encompassing both CascadeDirect.com and CascadeMarket — was approximately $43.7 billion in fiscal year 2024. This figure reflects the substantial scale of Cascade's overall e-commerce operations, of which CascadeMarket's $3.1 billion in third-party seller GMV represents only a fraction. The FTC's market definition captures only this marketplace GMV component, ignoring the vast majority of Cascade's e-commerce competitive presence.

B. Pinnacle Market Group Inc.

18. Pinnacle Market Group Inc. ("Pinnacle") is a Delaware corporation headquartered at 500 East 6th Street, Suite 800, Austin, Texas 78701. Pinnacle was co-founded in 2014 by Rajiv Chandravar and Lena Kowalski as an online marketplace platform designed to connect independent sellers — particularly artisans, makers, and specialty merchants — with consumers seeking differentiated, unique, and curated products.

19. Pinnacle completed its initial public offering on September 18, 2020, listing its common stock on the Nasdaq Global Select Market under the ticker symbol "PMGI." The IPO was part of a broader wave of marketplace platform offerings during the 2020–2021 period, fueled by the rapid expansion of e-commerce during the COVID-19 pandemic.

20. Pinnacle operates an online marketplace platform that connects independent sellers with consumers across a range of product categories, including home goods, artisanal products, specialty foods, fashion and accessories, and consumer electronics. The platform provides sellers with storefront management tools, payment processing, advertising and promotional services, analytics dashboards, and customer engagement features. Pinnacle does not operate its own fulfillment network and instead relies primarily on sellers to manage their own shipping and fulfillment, although Pinnacle has partnered with several third-party logistics providers to offer optional fulfillment assistance to sellers.

21. For fiscal year 2024 (ending December 31, 2024), Pinnacle reported $11.4 billion in GMV transacted through its platform by approximately 185,000 active sellers. Pinnacle generated $1.82 billion in net revenue, reflecting an average take rate of approximately 16% ($11.4 billion GMV × 16% ≈ $1.824 billion, rounded to $1.82 billion). Pinnacle's revenue is derived from transaction fees charged to sellers on each completed sale, listing fees, advertising and promotional services, and optional value-added services.

22. Pinnacle's pre-announcement market capitalization was approximately $3.9 billion, based on 175,047,319 shares of common stock outstanding and an unaffected closing price of $22.30 per share on March 7, 2025 — the last trading day prior to the period in which market rumors of a potential transaction began to affect Pinnacle's stock price (175,047,319 shares × $22.30 ≈ $3,903,555,414).

C. Transaction Terms

23. On March 14, 2025, Cascade and Pinnacle entered into an Agreement and Plan of Merger (the "Merger Agreement") pursuant to which Cascade agreed to acquire all outstanding shares of Pinnacle common stock in an all-cash transaction. The transaction was publicly announced on March 17, 2025, via simultaneous press releases and a Current Report on Form 8-K filed by Cascade with the Securities and Exchange Commission.

24. Under the terms of the Merger Agreement, Cascade will acquire each outstanding share of Pinnacle common stock for $26.85 per share in cash, without interest, for aggregate merger consideration of approximately $4.7 billion (175,047,319 shares × $26.85 per share ≈ $4,700,020,415). The per-share price of $26.85 represents a premium of approximately 20.4% over Pinnacle's unaffected closing price of $22.30 on March 7, 2025 (($26.85 – $22.30) / $22.30 ≈ 20.4%).

25. The transaction is structured as a reverse triangular merger. CRH Merger Sub Inc. ("Merger Sub"), a Delaware corporation and wholly owned subsidiary of Cascade formed for the purpose of effecting the transaction, will merge with and into Pinnacle, with Pinnacle surviving the merger as a wholly owned subsidiary of Cascade. This structure preserves Pinnacle's corporate existence and contractual relationships while enabling Cascade to acquire full ownership and control.

26. The transaction is to be financed through a combination of (a) approximately $1.9 billion in cash on hand from Cascade's balance sheet and (b) $2.8 billion in borrowings under a senior secured Term Loan B facility provided by Whitmore National Bank, N.A. pursuant to a commitment letter dated March 12, 2025 (Reference No. CRH-WNB-2025-TLB). Cascade has also arranged a $500 million revolving credit facility, which is not expected to be drawn at closing but provides additional financial flexibility.

27. The Merger Agreement contains customary termination provisions, including a reverse termination fee of $282 million (approximately 6% of the aggregate merger consideration) payable by Cascade in the event Cascade fails to consummate the transaction under specified circumstances, and a company termination fee of $164.5 million (approximately 3.5% of the aggregate merger consideration) payable by Pinnacle in the event Pinnacle terminates the Merger Agreement to accept a superior proposal. The magnitude of the reverse termination fee reflects the significant regulatory risk associated with the transaction and the parties' expectation that antitrust review would be the primary obstacle to closing.

28. The outside date for consummation of the transaction is March 14, 2026, subject to automatic extension to June 14, 2026 if the sole unsatisfied closing condition as of the initial outside date is the receipt of required antitrust clearances. This extended outside date reflects the parties' anticipation of a potentially protracted regulatory review process.

D. Regulatory History

29. The parties filed their notification forms under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 ("HSR Act") on April 2, 2025 (Transaction No. HSR-20250402-0347). On May 7, 2025, the Federal Trade Commission issued a Request for Additional Information and Documentary Material (commonly referred to as a "Second Request") to both Cascade and Pinnacle, initiating a detailed investigation of the proposed transaction (File No. 251-0089).

30. Both parties worked diligently to comply with the Second Request. Cascade certified substantial compliance with the Second Request on June 10, 2025. Pinnacle's compliance was certified on the same date. The volume of materials produced in response to the Second Request was substantial, encompassing millions of documents, including internal business documents, financial records, strategic plans, board presentations, and communications relating to competitive strategy, the marketplace business, and the proposed transaction.

31. On June 20, 2025, the Federal Trade Commission issued an Administrative Complaint against Cascade and Pinnacle (Docket No. 9438), alleging that the proposed acquisition, if consummated, would substantially lessen competition in the market for "online marketplace platform services for third-party sellers in the United States" in violation of Section 7 of the Clayton Act, 15 U.S.C. § 18, and Section 5 of the Federal Trade Commission Act, 15 U.S.C. § 45.

32. On June 23, 2025, the FTC filed a Complaint in this Court seeking a temporary restraining order and preliminary injunction to enjoin the proposed transaction pending the outcome of the administrative proceeding, pursuant to Section 13(b) of the FTC Act, 15 U.S.C. § 53(b). The case was assigned to the Honorable Richard A. Johannsen.

33. The Commission's vote to authorize the filing of the Complaint and the administrative action was 3–2, reflecting significant internal division within the Commission regarding the merits of the challenge. The two dissenting Commissioners expressed concerns about the narrowness of the proposed market definition and the strength of the evidence supporting the Commission's theory of harm. This internal division is notable because it suggests that even within the agency, reasonable economists and policy professionals disagree about whether this transaction raises genuine competitive concerns.

III. FRAMEWORK FOR MARKET DEFINITION ANALYSIS

A. Legal and Economic Standards

34. Section 7 of the Clayton Act prohibits mergers and acquisitions "where in any line of commerce or in any activity affecting commerce in any section of the country, the effect of such acquisition may be substantially to lessen competition, or to tend to create a monopoly." 15 U.S.C. § 18. To establish a violation of Section 7, the FTC bears the burden of demonstrating that the proposed transaction is likely to substantially lessen competition in a properly defined relevant market.

35. The definition of the relevant market is a critical threshold inquiry in any merger challenge. The relevant market defines the arena of competition within which the anticompetitive effects of a merger are to be assessed. An improperly defined market — whether too narrow or too broad — will distort the competitive analysis and lead to unreliable conclusions about the likely effects of a transaction. As the Supreme Court recognized in Brown Shoe Co. v. United States, 370 U.S. 294, 325 (1962), the relevant market must correspond to "the commercial realities of the industry."

36. The analytical framework for defining relevant markets in merger cases is well established in economic theory, in the case law, and in the Horizontal Merger Guidelines jointly issued by the Department of Justice and the Federal Trade Commission (the "Merger Guidelines"). The core analytical tool for market definition is the hypothetical monopolist test, also known as the SSNIP (Small but Significant Non-transitory Increase in Price) test.

37. The SSNIP test asks whether a hypothetical profit-maximizing firm that was the only present and future seller of a defined set of products in a defined geographic area would impose at least a small but significant non-transitory increase in price (typically 5–10%) on at least one product in the candidate market. If the hypothetical monopolist would find such a price increase profitable — that is, if the revenue gains from higher prices on retained sales would exceed the revenue losses from sales diverted to products outside the candidate market — then the candidate market is a relevant antitrust market. If the hypothetical monopolist would not find the price increase profitable, because sufficient sales would be diverted to substitutes outside the candidate market, then the candidate market must be expanded to include those substitutes.

38. Market definition analysis considers both demand-side and supply-side substitution. Demand-side substitution measures the extent to which consumers (or, in this case, sellers and buyers on a platform) would switch to alternative products or services in response to a price increase. Supply-side substitution measures the extent to which firms not currently producing the relevant product could readily begin producing it in response to a price increase, thereby expanding supply and constraining the hypothetical monopolist's pricing power. Both forms of substitution are recognized as relevant considerations in defining the boundaries of the relevant market.

B. Two-Sided Platform Considerations

39. Online marketplaces such as CascadeMarket and Pinnacle are multi-sided platforms that serve as intermediaries between at least two distinct user groups — sellers and buyers. The platform creates value by facilitating transactions between these groups, and the platform's economic model depends on attracting and retaining users on both sides simultaneously. This multi-sided nature has important implications for market definition and competitive effects analysis.

40. In Ohio v. Halcyon Corporation, 138 S. Ct. 2274 (2018), the Supreme Court addressed the antitrust analysis of two-sided transaction platforms. The Court held that for two-sided transaction platforms — platforms where the platform facilitates a single, simultaneous transaction between users on each side — "the relevant market must include both sides of the platform." Id. at 2287. The Court explained that "[o]nly other two-sided platforms can compete with a two-sided platform for transactions" and that "[d]efining the relevant market on only one side of the platform . . . leads to 'misleading' results." Id. at 2286 (quoting Filistrucchi et al., Market Definition in Two-Sided Markets: Theory and Practice, 10 J. Competition L. & Econ. 293, 296 (2014)).

41. The implications of Ohio v. Pinnacle Partners LLC for this case are significant. Online marketplaces like CascadeMarket, Pinnacle, Vertex Commerce, and Nomad Shops are quintessential two-sided transaction platforms. They facilitate individual transactions between sellers and buyers, and the value of the platform to each side depends on the participation and behavior of users on the other side. Sellers value a platform with more buyers; buyers value a platform with more sellers and a wider product selection. These indirect network effects are a fundamental feature of marketplace platform economics.

42. The FTC's proposed market definition in this case — "online marketplace platform services for third-party sellers in the United States" — defines the market exclusively from the seller side of the platform. It measures market shares based on seller-side metrics (the volume of GMV transacted by third-party sellers) and assesses competitive harm based on effects on sellers (increased take rates, reduced seller services). This one-sided approach is directly at odds with the Supreme Court's instruction in Ohio v. Pinnacle Partners LLC that the relevant market for a two-sided transaction platform must account for both sides.

43. The failure to account for the buyer side of the platform is not merely a technical deficiency. It introduces systematic bias into the competitive analysis. A platform's ability to raise take rates to sellers is constrained not only by the availability of alternative platforms for sellers but also by the effect of higher take rates on the platform's attractiveness to buyers. Higher take rates may lead sellers to raise prices on the platform, which in turn may cause buyers to shift their purchases to competing platforms or to non-marketplace e-commerce channels. Ignoring this buyer-side constraint overstates the hypothetical monopolist's ability to profitably raise prices and leads to an artificially narrow market definition.

C. Analytical Approach Used in This Report

44. In conducting my market definition analysis, I have employed a comprehensive empirical approach that accounts for both demand-side and supply-side substitution, considers both sides of the marketplace platform, and is grounded in the actual competitive behavior of market participants.

45. Specifically, my analysis includes the following elements:

(a) Demand-side substitution analysis. I have examined the substitution behavior of both sellers and buyers across marketplace platforms, direct-to-consumer e-commerce channels, social commerce platforms, and hybrid retail models. This analysis draws on transaction-level data from Cascade and Pinnacle produced in discovery, industry-level data on e-commerce purchasing patterns, and consumer and seller survey evidence.

(b) Supply-side substitution analysis. I have analyzed the ability of firms not currently operating marketplace platforms to enter the marketplace segment or expand their existing marketplace offerings in response to a price increase. This analysis considers the availability of marketplace technology infrastructure, the capital requirements for marketplace entry, and the historical evidence of entry and expansion in this space.

(c) Cross-elasticity of demand analysis. I have estimated cross-elasticities of demand between marketplace channels and direct retail channels to quantify the degree to which these channels compete for the same transactions. This analysis uses transaction-level data and econometric techniques to measure the responsiveness of marketplace demand to changes in non-marketplace e-commerce prices and service levels, and vice versa.

(d) Econometric analysis. I have conducted econometric analyses using transaction-level data from Cascade, Pinnacle, and industry sources to estimate diversion ratios, price elasticities, and competitive interaction parameters. These analyses inform both the market definition inquiry and the competitive effects assessment.

(e) Seller multi-homing analysis. I have analyzed the extent to which sellers simultaneously maintain presences on multiple platforms and the implications of multi-homing for competitive constraints and market definition. This analysis draws on seller-level data from Pinnacle and CascadeMarket, seller survey evidence, and publicly available information on seller behavior.

46. The detailed results of these analyses are presented in the sections that follow and summarized in the tables and figures attached as Exhibit C.

IV. RELEVANT PRODUCT MARKET DEFINITION

A. The FTC's Proposed Market: "Online Marketplace Platform Services for Third-Party Sellers in the United States"

47. The FTC's Complaint defines the relevant product market as "online marketplace platform services for third-party sellers in the United States." See FTC Complaint ¶¶ 38–45. Under this definition, the relevant market encompasses only those platforms that operate a marketplace model — i.e., platforms that serve as intermediaries facilitating transactions between third-party sellers and consumers, where the platform provides marketplace infrastructure services (such as search, payment processing, and storefront tools) and charges sellers a commission or fee for each transaction.

48. Under this narrow definition, the FTC identifies four "significant participants" in the alleged relevant market, with the following shares based on GMV:

See FTC Complaint ¶ 42; see also Exhibit C, Table 1.

49. Under this market definition, the proposed merger would combine the second-largest participant (Pinnacle, at 30.1%) with the fourth-largest participant (CascadeMarket, at 8.2%), yielding a combined share of 38.3%. The FTC calculates a pre-merger HHI of 2,361, a post-merger HHI of 2,856, and an HHI delta of 495 — figures that exceed the thresholds identified in the Merger Guidelines as creating a presumption of anticompetitive effects. See FTC Complaint ¶ 47.

50. Critically, the FTC's proposed market excludes several significant categories of competitive activity that directly constrain the behavior of marketplace platforms: (1) direct-to-consumer e-commerce, including Cascade's own CascadeDirect.com platform; (2) social commerce platforms that facilitate seller-consumer transactions through social media channels; (3) brick-and-mortar retail, which competes for many of the same consumer transactions; and (4) hybrid retail models that combine elements of direct retail and marketplace intermediation.

51. For the reasons set forth below, the FTC's proposed market definition is artificially narrow, fails the hypothetical monopolist (SSNIP) test, and excludes significant competitive constraints that discipline the behavior of marketplace platforms. The FTC's market definition leads to inflated market shares, inflated HHI calculations, and a fundamentally distorted picture of the competitive landscape.

B. Critique of the FTC's Narrow Market

1. Demand-Side Substitution Is Pervasive

52. The first and most fundamental flaw in the FTC's market definition is its failure to account for pervasive demand-side substitution between marketplace platform transactions and other forms of e-commerce. The evidence demonstrates that both consumers and sellers routinely substitute between marketplace channels and non-marketplace e-commerce channels, and that a hypothetical monopolist of marketplace platform services would be unable to profitably impose a small but significant non-transitory increase in price because of this substitution.

53. Consumer substitution. On the buyer side, consumers do not distinguish between "marketplace" and "non-marketplace" e-commerce when making purchasing decisions. A consumer searching for a kitchen appliance, a piece of home decor, or a pair of running shoes does not confine her search to marketplace platforms. She comparison-shops across a range of channels, including marketplace listings on Pinnacle or CascadeMarket, direct-to-consumer websites operated by brands or retailers, social commerce posts on platforms like Northpoint Services Inc. and Dunmore & Co., and in many cases, brick-and-mortar stores. The consumer's relevant consideration set is defined by the product she seeks, not by the business model of the retail channel through which she might purchase it.

54. Data from Cascade's internal analytics, produced in discovery, confirm this pattern. Cascade's analysis of consumer purchase behavior shows that consumers who purchase products through CascadeMarket also frequently purchase similar products through CascadeDirect.com and through competing direct-to-consumer websites within the same shopping session or within a short time window. These data demonstrate that from the consumer's perspective, marketplace and non-marketplace e-commerce channels are close substitutes.

55. Industry-wide survey evidence further corroborates this finding. A 2024 survey conducted by Meridian Consumer Insights, which I reviewed in preparing this report, found that 72% of consumers who had made a purchase on a marketplace platform in the preceding 90 days had also made a purchase of a similar product category through a direct-to-consumer e-commerce website during the same period. This high rate of cross-channel purchasing is inconsistent with the FTC's claim that marketplace platforms constitute a distinct relevant market.

56. Seller substitution. On the seller side, sellers likewise do not confine their sales activity to marketplace platforms. As discussed in greater detail below, a substantial majority of sellers on Pinnacle and CascadeMarket simultaneously sell through other channels, including their own direct-to-consumer websites, other marketplace platforms, and social commerce platforms. Sellers respond to changes in marketplace platform terms — including take rates, service levels, and listing policies — by shifting sales volume to alternative channels. This seller-side substitution is a direct competitive constraint on marketplace platforms that is ignored by the FTC's one-sided market definition.

57. SSNIP analysis. My analysis demonstrates that a hypothetical monopolist of "online marketplace platform services for third-party sellers in the United States" would not be able to profitably impose a 5% increase in take rates (the relevant "price" variable for marketplace platform services). Such an increase would cause sufficient diversion of both sellers and buyers to direct-to-consumer e-commerce channels, social commerce platforms, and other non-marketplace alternatives to render the price increase unprofitable. The magnitude of the predicted diversion — driven by the high rates of consumer cross-channel shopping and seller multi-homing documented above — is more than sufficient to defeat the FTC's candidate market under the hypothetical monopolist test. This result holds even when the SSNIP test is applied at the 10% level.

2. Supply-Side Substitution Is Readily Available

58. The FTC's narrow market definition also fails to account for the ease with which firms currently operating outside the marketplace segment can enter or expand into marketplace platform services. Supply-side substitution is a recognized basis for expanding the relevant market under the Merger Guidelines, and the evidence of supply-side substitution in this case is compelling.

59. The most striking evidence of supply-side substitution is the history of Cascade's own CascadeMarket. CascadeMarket was launched on June 1, 2019, as an extension of Cascade's existing direct-to-consumer e-commerce platform. Within approximately five years, CascadeMarket grew to $3.1 billion in GMV and approximately 42,000 active third-party sellers, capturing 8.2% of the FTC's narrowly defined market. CascadeMarket's entry demonstrates that a firm with an established e-commerce platform and logistics infrastructure can readily add marketplace functionality and achieve significant scale within a relatively short period. If CascadeMarket is evidence of the ease of entry from adjacent channels, it is inconsistent for the FTC to exclude other firms with similar capabilities from the relevant market.

60. Beyond CascadeMarket, the evidence of supply-side substitution includes the recent entry of social commerce platforms into marketplace intermediation. Brevity Social Commerce Inc., launched in 2023, integrates marketplace functionality into a social media platform, enabling sellers to list products and consummate transactions directly within the social media environment. Trove Marketplace Inc., launched in 2024, entered the curated marketplace space with a focus on pre-owned, vintage, and sustainable goods. Both entrants demonstrate that the technology and business model for marketplace intermediation are accessible to a wide range of firms, not only to incumbents in the narrowly defined marketplace segment.

61. The technology infrastructure required to operate a marketplace platform is widely available through cloud-based Software-as-a-Service ("SaaS") solutions. Companies such as Dunmore Services Inc., Halcyon Systems, and Camberwell Data Systems offer turnkey marketplace technology platforms that enable any retailer or technology company to launch marketplace functionality with relatively modest investment. This widespread availability of marketplace-enabling technology further supports the conclusion that supply-side substitution into the marketplace segment is timely, likely, and sufficient — and that the FTC's narrow market definition fails to account for this competitive constraint.

3. Seller Multi-Homing Undermines the Narrow Market

62. A further critical flaw in the FTC's market definition is its failure to account for the pervasive practice of seller multi-homing — the simultaneous maintenance of seller presences on multiple platforms and channels. Multi-homing is a fundamental feature of the online marketplace ecosystem, and it has important implications for market definition and competitive effects analysis.

63. My analysis of seller-level data from Pinnacle and CascadeMarket demonstrates that multi-homing is the norm, not the exception. Approximately 68% of Pinnacle sellers also sell through at least one other channel, including direct-to-consumer websites, Vertex Commerce, Nomad Shops, CascadeMarket, and social commerce platforms. Similarly, approximately 74% of CascadeMarket sellers sell through at least one other channel. These rates of multi-homing are based on seller survey data, cross-platform matching of seller identifiers, and analysis of seller transaction patterns.

64. The high prevalence of seller multi-homing has two important implications for market definition. First, it demonstrates that sellers view marketplace platforms and alternative channels as substitutes — they simultaneously participate in multiple channels and can readily shift sales volume between them. This is direct evidence of demand-side substitution on the seller side that undermines the FTC's claim that marketplace platforms constitute a distinct relevant market.

65. Second, multi-homing reduces the switching costs that sellers face when responding to changes in marketplace platform terms. A seller who is already active on multiple platforms does not need to invest in building a new storefront, establishing a new customer base, or learning a new set of tools when shifting sales volume from one platform to another. The incremental cost of redirecting sales is low, which means that marketplace platforms face a highly elastic seller demand curve — precisely the condition that defeats a candidate market under the hypothetical monopolist test.

4. The FTC's Market Excludes the Primary Competitive Constraint

66. Perhaps the most significant distortion introduced by the FTC's narrow market definition is its exclusion of Cascade's direct-to-consumer e-commerce business from the relevant market. Cascade's total e-commerce GMV — encompassing both CascadeDirect.com and CascadeMarket — was approximately $43.7 billion in fiscal year 2024. Of this total, CascadeMarket's third-party seller GMV of $3.1 billion represents only approximately 7.1%.

67. Pinnacle's GMV of $11.4 billion, while substantial in absolute terms, is dwarfed by Cascade's total e-commerce footprint of $43.7 billion. Yet the FTC's market definition captures only the $3.1 billion CascadeMarket GMV and the $11.4 billion Pinnacle GMV, ignoring the $40.6 billion in Cascade DTC e-commerce sales that directly compete for many of the same consumer transactions.

68. The practical effect of this exclusion is to artificially inflate the competitive significance of the CascadeMarket-Pinnacle combination. In the FTC's narrow market, the combined entity appears to have a 38.3% share; in the broader e-commerce market, its share is approximately 7.3%. The FTC's approach treats CascadeDirect.com — which sells many of the same product categories as Pinnacle and CascadeMarket sellers and competes directly for the same consumer purchases — as though it operates in an entirely separate market. This treatment is inconsistent with economic reality, with the evidence of consumer substitution behavior, and with the Supreme Court's instruction that market definition must reflect "commercial realities."

C. The Correct Market: "All E-Commerce Retail in the United States"

69. Properly accounting for demand-side and supply-side substitution, and properly treating both sides of the marketplace platform, the relevant product market in this case is "all e-commerce retail in the United States." This market encompasses the full range of retail transactions facilitated through internet-based channels, including:

(a) marketplace platform transactions, in which third-party sellers transact with consumers through an intermediary platform;

(b) direct-to-consumer e-commerce, in which retailers and brands sell directly to consumers through their own websites and mobile applications;

(d) hybrid retail with online ordering, in which traditional retailers offer online purchasing with options for home delivery or in-store pickup; and

(e) any other retail transactions facilitated through internet-based channels.

70. Total U.S. e-commerce GMV in 2024 was approximately $757 billion, according to industry estimates from the U.S. Census Bureau and leading e-commerce research firms. This figure encompasses all of the categories described above and represents the total addressable market within which marketplace platforms, direct-to-consumer retailers, social commerce platforms, and hybrid retailers compete for consumer transactions.

71. Under this properly defined market, the combined Cascade and Pinnacle share of total U.S. e-commerce GMV is as follows:

• Marketplace GMV only (CascadeMarket + Pinnacle): $14.5 billion ($3.1 billion + $11.4 billion) / $757 billion = approximately 1.9%.

• Including Cascade's total e-commerce GMV: $55.1 billion ($43.7 billion + $11.4 billion) / $757 billion = approximately 7.3%.

72. Under either calculation, the combined entity's share of the relevant market is far below any presumptive threshold of competitive concern recognized in the Merger Guidelines or in the case law. The Merger Guidelines identify markets with a post-merger HHI below 1,500 as "unconcentrated," and mergers in unconcentrated markets are "unlikely to have adverse competitive effects." In the "all e-commerce retail" market, the post-merger HHI is well below 1,500, and the HHI delta attributable to the transaction is de minimis.

73. The market shares and HHI calculations under the properly defined market are summarized in Exhibit C, Tables 2 and 3.

D. Geographic Market

74. Both the FTC and the Defendants agree that the relevant geographic market in this case is the United States. I concur with this assessment. CascadeMarket and Pinnacle both operate as nationwide platforms, serving sellers and consumers throughout the United States. The competitive conditions that govern marketplace platform behavior — including take rates, seller services, consumer pricing, and logistics capabilities — are generally uniform across the country. Accordingly, the geographic scope of the relevant market does not present a contested issue, and my analysis focuses on the definition of the relevant product market.

V. COMPETITIVE EFFECTS ANALYSIS

A. The FTC's Theory of Harm

75. The FTC alleges that the proposed acquisition of Pinnacle by Cascade would substantially lessen competition in the market for "online marketplace platform services for third-party sellers in the United States" by combining two of the four significant participants in that market. Specifically, the FTC alleges that the merger would eliminate head-to-head competition between CascadeMarket and Pinnacle, enabling the merged entity to exercise market power over third-party sellers through: (1) increased take rates; (2) reduced seller services; and (3) diminished innovation in marketplace features and functionality. The FTC further alleges a "trend toward concentration" in online marketplaces that the proposed transaction would exacerbate.

76. For the reasons set forth below, the FTC's theory of harm is unsupported by the evidence and is based on a fundamentally flawed market definition. When the transaction is assessed within the properly defined relevant market — or even within the FTC's narrow market, when competitive dynamics are properly accounted for — the evidence does not support a conclusion that the merger is likely to substantially lessen competition.

B. Market Concentration Analysis

1. HHI Under the FTC's Narrow Market

77. The FTC's HHI calculations are derived from the market share figures set forth in the FTC Complaint at paragraph 42. Using those shares, the FTC calculates:

• Pre-merger HHI: 8.2² + 30.1² + 35.7² + 14.6² + (distributed "all others" at 11.4%) = approximately 2,361

• Post-merger HHI: 38.3² + 35.7² + 14.6² + (distributed "all others" at 11.4%) = approximately 2,856

• HHI Delta: 2 × 8.2 × 30.1 = 493.64 ≈ 495 (reflecting rounding in the underlying share figures)

78. Under the Merger Guidelines, a post-merger HHI exceeding 2,500 with a delta above 200 is identified as creating a presumption that the merger "is likely to enhance market power." The FTC's HHI figures exceed these thresholds.

79. However, the probative value of these HHI calculations depends entirely on the correctness of the underlying market definition. As I have demonstrated in Section IV above, the FTC's proposed market is artificially narrow, fails the hypothetical monopolist test, and excludes significant competitive constraints. The HHI figures of 2,361 and 2,856 are artifacts of this improperly gerrymandered market — they are products of the market definition, not measures of genuine competitive conditions.

80. Even within the FTC's narrow market, the HHI calculations require careful contextualization. The Merger Guidelines recognize that HHI thresholds are starting points for analysis, not dispositive conclusions. A post-merger HHI above 2,500 creates a rebuttable presumption that may be overcome by evidence that the transaction is unlikely to enhance market power despite the concentration metrics. As discussed below, the evidence in this case — including pervasive multi-homing, low barriers to entry, recent entry, competitive fringe, and the weakening competitive position of Pinnacle — rebuts any presumption that might be drawn from the FTC's HHI calculations.

2. HHI Under the Correct Broader Market

81. Under the properly defined "all e-commerce retail in the United States" market, the combined entity's share is approximately 7.3%. In this market, hundreds of competitors — including major retailers with substantial e-commerce operations, pure-play e-commerce companies, social commerce platforms, and specialty online retailers — collectively account for the vast majority of the $757 billion in total U.S. e-commerce GMV. Even attributing generous shares to the largest competitors, the post-merger HHI in this market is well below 1,500, firmly in the "unconcentrated" range identified in the Merger Guidelines.

82. The HHI delta attributable to the transaction in the broader market is de minimis — on the order of a few points. Under the Merger Guidelines, mergers in unconcentrated markets are "unlikely to have adverse competitive effects and ordinarily require no further analysis."

83. A comparison of the HHI calculations under the FTC's narrow market and the properly defined broader market is set forth in Exhibit C, Table 3. The dramatic difference in concentration metrics — from a "highly concentrated" market under the FTC's definition to an "unconcentrated" market under the proper definition — illustrates the extent to which the FTC's competitive concerns are driven by its market definition choices rather than by genuine competitive conditions.

3. Market Shares Are Misleading in a Dynamic Digital Market

84. Even if the FTC's narrow market definition were accepted arguendo, static market shares would be a poor predictor of competitive effects in this industry. Online marketplace platforms operate in a rapidly evolving digital environment characterized by frequent entry, technological innovation, shifting consumer preferences, and volatile competitive positions. Market shares in such environments are inherently unstable and reflect past competitive outcomes rather than future competitive constraints.

85. The history of CascadeMarket itself illustrates this point. CascadeMarket launched on June 1, 2019, with zero market share. Within approximately five years, it grew to 8.2% of the FTC's narrowly defined market — $3.1 billion in GMV and 42,000 active sellers. This trajectory demonstrates that market positions in the marketplace segment can change dramatically within a short period, and that current market shares may not reliably predict future competitive conditions.

86. Similarly, Pinnacle's share has been declining as its growth rate decelerates. Pinnacle's GMV growth rate has fallen from 28% YoY in 2022 to 9% YoY in 2024. If this trend continues, Pinnacle's share of the marketplace segment will decline further, even absent the proposed merger. Static market shares, calculated at a single point in time, fail to capture this dynamic trajectory and overstate Pinnacle's competitive significance going forward.

C. Unilateral Effects Analysis

1. Closeness of Competition

87. The FTC's unilateral effects theory rests on the premise that CascadeMarket and Pinnacle are close competitors whose head-to-head competition would be eliminated by the merger. Under standard unilateral effects analysis in differentiated product markets, the magnitude of predicted unilateral effects depends critically on the closeness of competition between the merging parties — specifically, the extent to which each party constrains the other's pricing and service decisions relative to other competitors.

88. My analysis of the competitive positioning of CascadeMarket and Pinnacle indicates that while they serve overlapping customer segments, they are significantly differentiated in ways that limit their closeness of competition. CascadeMarket is primarily positioned as a complement to Cascade's existing retail ecosystem. It leverages Cascade's brand recognition, consumer traffic, and fulfillment infrastructure to offer sellers access to Cascade's established customer base. CascadeMarket's product mix is heavily weighted toward the same categories in which Cascade's physical and DTC operations are strongest — home goods, electronics, and general merchandise.

89. Pinnacle, by contrast, was founded as a platform for independent artisans, makers, and specialty sellers. Its seller base and product mix are oriented toward differentiated, curated, and niche products — artisanal goods, specialty foods, handmade fashion, and unique home decor. While Pinnacle has expanded into broader product categories in recent years, its core identity and value proposition remain distinct from CascadeMarket's mass-retail-adjacent positioning.

90. This differentiation is reflected in the diversion ratios between the merging parties. My analysis of actual seller transaction data — including sellers' responses to changes in take rates and service levels on individual platforms — indicates that the diversion ratio from Pinnacle to CascadeMarket is substantially lower than the diversion ratio from Pinnacle to Vertex Commerce. That is, when Pinnacle sellers reduce their activity on Pinnacle or leave the platform entirely, the primary beneficiary is Vertex Commerce, not CascadeMarket. This finding is consistent with the competitive positioning of the platforms: Vertex Commerce, as the largest marketplace platform, offers a broad seller base and consumer reach that is a closer substitute for Pinnacle than CascadeMarket's more limited marketplace offering.

91. The diversion ratio analysis is summarized in Exhibit C, Figure 1. The relatively low diversion ratio between the merging parties — compared to diversion between Pinnacle and Vertex Commerce, and between Pinnacle and direct-to-consumer channels — indicates that CascadeMarket is not Pinnacle's closest competitor and that the competitive constraint eliminated by the merger is modest relative to the constraints imposed by Vertex Commerce, Nomad Shops, and the broader e-commerce ecosystem.

2. Upward Pricing Pressure Analysis

92. I have conducted a Gross Upward Pricing Pressure Index ("GUPPI") analysis to assess the predicted price effects of the merger on take rates charged to sellers. The GUPPI methodology, which is discussed in the Merger Guidelines as an indicator of unilateral incentives to raise prices post-merger, calculates the value of diverted sales recaptured by the merger partner, expressed as a proportion of the pre-merger price.

93. The GUPPI analysis indicates that the predicted upward pricing pressure from the merger is minimal. The low diversion ratios between CascadeMarket and Pinnacle — reflecting their differentiated competitive positions — translate into low GUPPI values that fall well below the levels typically associated with competitive concern. The detailed GUPPI results are presented in Exhibit C, Figure 2.

94. Moreover, any upward pricing pressure that might exist is offset by two countervailing forces. First, the efficiencies generated by the merger — discussed in detail in Section VII below — create downward pricing pressure by reducing the merged entity's costs of serving sellers. Second, the competitive constraints imposed by Vertex Commerce (35.7% share in the FTC's market), Nomad Shops (14.6%), and the competitive fringe (11.4%, including new entrants) limit the merged entity's ability to profitably raise take rates. Sellers facing a take-rate increase would divert volume to these alternatives, eroding the profitability of any price increase.

3. Multi-Homing Constrains Unilateral Effects

95. The pervasive practice of seller multi-homing — documented in Section IV.B.3 above — provides an additional and significant constraint on unilateral effects. When approximately 68% of Pinnacle sellers and 74% of CascadeMarket sellers already maintain presences on multiple platforms, the merged entity's ability to raise take rates or reduce service levels is severely constrained. Multi-homing sellers can redirect sales volume to alternative platforms without incurring the costs of establishing a new platform presence, because they already have one.

96. Consider the scenario posited by the FTC: that the merged entity would increase take rates for sellers on the combined platform. In a world where sellers are single-homed — i.e., they sell exclusively on the merged platform — such a take-rate increase might be profitable because the switching costs for sellers would be high. But in a world where the vast majority of sellers are already active on multiple platforms, the take-rate increase would cause an immediate and measurable diversion of seller activity to Vertex Commerce, Nomad Shops, direct-to-consumer channels, and social commerce platforms. This diversion would reduce the merged entity's transaction volume, advertising revenue, and overall platform value, making the take-rate increase unprofitable.

97. Buyer multi-homing further constrains the merged entity's pricing power. Consumers are not locked into any single marketplace platform; they routinely comparison-shop across platforms and channels. If the merged entity's take-rate increase causes sellers to raise prices on the platform or to divert their best products and inventory to competing platforms, consumers will follow the value — purchasing on Vertex Commerce, Nomad Shops, direct-to-consumer websites, or social commerce platforms where prices are lower or product selection is better. The loss of buyer traffic, in turn, would reduce the platform's value to sellers, creating a negative feedback loop that further constrains the merged entity's ability to exercise market power.

D. Coordinated Effects Analysis

98. In addition to unilateral effects, the FTC's competitive effects theory may also encompass concerns about coordinated effects — the possibility that the merger would make it easier for the remaining firms in the marketplace segment to coordinate their behavior, either through explicit agreement or through tacit coordination facilitated by the merger's reduction in the number of significant competitors.

99. Under the FTC's narrow market definition, the post-merger marketplace segment would have three significant firms: the combined Cascade-Pinnacle entity (38.3%), Vertex Commerce (35.7%), and Nomad Shops (14.6%), along with a competitive fringe accounting for 11.4% of the market. The reduction in the number of significant competitors from four to three could, in theory, facilitate coordinated behavior by reducing the complexity of coordination and making it easier for firms to monitor and enforce coordinated outcomes.

100. However, my analysis indicates that coordinated effects are unlikely for several reinforcing reasons:

(a) High product differentiation. The marketplace platforms in this segment are highly differentiated in their seller bases, category focus, consumer demographics, and value propositions. Vertex Commerce operates as a broad-based marketplace with a focus on scale and category breadth; Pinnacle has historically focused on artisanal and specialty

UNITED STATES DISTRICT COURT WESTERN DISTRICT OF WASHINGTON SEATTLE DIVISION
EXPERT REPORT OF DR. PRIYA RAMANATHAN ON MARKET DEFINITION AND COMPETITIVE EFFECTS
Filed on Behalf of Defendants Cascade Retail Holdings Inc. and Pinnacle Market Group Inc.
August 18, 2025
Prepared by:
Dr. Priya Ramanathan Managing Director Brindoval Analytics LLC 1700 Pennsylvania Avenue NW, Suite 550 Washington, D.C. 20006
Counsel of Record:
Howard Bellamy Elaine Forsythe Calderwood & Harkness LLP 1401 K Street NW, Suite 1200 Washington, D.C. 20005
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I. INTRODUCTION AND SUMMARY OF OPINIONS
A. Identity and Qualifications of Expert
1. My name is Priya Ramanathan. I am a Managing Director of Brindoval Analytics LLC, an economic consulting firm located at 1700 Pennsylvania Avenue NW, Suite 550, Washington, D.C. 20006. I hold a Ph.D. in Economics from Stanford University, where my doctoral research focused on industrial organization, competition policy, and the economics of multi-sided platforms. My full curriculum vitae is attached as Exhibit B to this report.
2. I have over twenty years of professional experience in the fields of industrial organization economics, antitrust analysis, and competition policy. Throughout my career, I have advised clients, government agencies, and courts on matters involving market definition, competitive effects analysis, merger review, and the economics of platform competition. I have been retained as an expert economist in numerous matters before federal district courts, the Federal Trade Commission, and the United States Department of Justice Antitrust Division. I have testified at trial, at evidentiary hearings, and by deposition on multiple occasions. A complete list of cases in which I have testified as an expert within the preceding four years is set forth in Exhibit B.
3. Prior to founding Brindoval Analytics, I served as a Senior Economist at the Bureau of Economics of the Federal Trade Commission and as an Associate Professor of Economics at Georgetown University. I have published extensively in peer-reviewed economics journals, including the American Economic Review, the Journal of Industrial Economics, the RAND Journal of Economics, and the Journal of Law and Economics. My publications address topics directly relevant to the matters at issue in this case, including multi-sided platform economics, indirect network effects, merger simulation in differentiated product markets, and the competitive dynamics of digital marketplaces.
4. Dr. Lucas Engström, a Senior Economist at Brindoval Analytics, assisted me in the preparation of this report. Dr. Engström holds a Ph.D. in Economics from the Massachusetts Institute of Technology and has extensive experience in empirical industrial organization and econometric analysis. The analysis in this report, including all econometric modeling, data analysis, and the conclusions drawn therefrom, reflects my own independent professional judgment.
5. I have been retained by Calderwood & Harkness LLP on behalf of Defendants Cascade Retail Holdings Inc. ("Cascade") and Pinnacle Market Group Inc. ("Pinnacle") to provide expert economic analysis and testimony in this matter. My retention agreement is dated July 2, 2025. I am being compensated at a flat fee of $1,800,000 through the preliminary injunction hearing, plus reimbursement of reasonable expenses. My compensation is not contingent on the substance of my opinions, the outcome of this litigation, or the consummation of the proposed transaction.
B. Assignment
6. I have been asked to evaluate the following issues in this proceeding:
(1) the proper definition of the relevant product and geographic markets for purposes of analyzing the competitive effects of Cascade's proposed acquisition of Pinnacle;
(2) the likely competitive effects of the proposed acquisition, including whether the transaction is likely to substantially lessen competition in any properly defined relevant market;
(3) whether claimed merger-specific efficiencies are cognizable and verifiable; and
(4) whether Pinnacle's competitive trajectory affects the competitive significance of the transaction.
7. The transaction at issue is an all-cash acquisition by Cascade of 100% of the outstanding common stock of Pinnacle Market Group Inc. for aggregate merger consideration of approximately $4.7 billion, or $26.85 per share. The transaction was publicly announced on March 17, 2025, and is structured as a reverse triangular merger in which CRH Merger Sub Inc., a wholly owned subsidiary of Cascade, will merge with and into Pinnacle, with Pinnacle surviving as a wholly owned subsidiary of Cascade.
C. Summary of Opinions
8. Based on my review of the extensive factual record in this case, my independent economic analysis, and my experience as an economist specializing in competition policy and platform economics, I have reached the following opinions, each of which is discussed in detail in the body of this report:
Opinion 1: The FTC's proposed relevant market is artificially narrow and fails standard economic tests. The Federal Trade Commission's proposed relevant product market — "online marketplace platform services for third-party sellers in the United States" — is artificially narrow, excludes significant competitive constraints that discipline the behavior of marketplace platforms, and fails standard SSNIP analysis. The proper relevant product market is "all e-commerce retail in the United States," which appropriately accounts for pervasive demand-side and supply-side substitution between marketplace platforms, direct-to-consumer e-commerce, social commerce, and hybrid retail models.
Opinion 2: Market shares under the properly defined market are far below any presumptive threshold of competitive concern. Under the properly defined relevant product market of "all e-commerce retail in the United States," the combined entity's share of total U.S. e-commerce gross merchandise value ("GMV") is approximately 7.3%, well below any presumptive threshold of competitive concern recognized in the Horizontal Merger Guidelines or in the case law. Even under the FTC's narrow market, the Herfindahl-Hirschman Index ("HHI") figures do not support a presumption of anticompetitive effects when properly contextualized within the competitive dynamics of the digital marketplace sector.
Opinion 3: The FTC's HHI calculations are artifacts of an improperly defined market. The FTC's HHI calculations — pre-merger HHI of 2,361, post-merger HHI of 2,856, and a delta of 495 — are the direct product of an improperly gerrymandered market definition. They overstate the transaction's competitive significance and do not reflect genuine competitive conditions in the broader e-commerce marketplace in which these firms operate.
Opinion 4: The merger will generate substantial verifiable, merger-specific efficiencies. The proposed transaction will generate verifiable, merger-specific efficiencies of approximately $340 million annually by Year 3 post-closing. These efficiencies include approximately $195 million in logistics and fulfillment cost savings resulting from the integration of Pinnacle's approximately 185,000 active sellers into Cascade's 22-warehouse nationwide fulfillment network, and approximately $145 million in technology and platform synergies resulting from the consolidation of duplicative infrastructure and the integration of complementary technology assets. These efficiencies are not achievable through less anticompetitive alternatives.
Opinion 5: Pinnacle's weakening competitive position materially reduces the anticompetitive potential of the transaction. Pinnacle is a weakening competitor whose GMV growth has decelerated from 28% year-over-year ("YoY") in 2022 to 9% YoY in 2024, and whose seller churn rate has nearly doubled from 12% in 2022 to 21% in 2024. Pinnacle's deteriorating competitive trajectory materially reduces the competitive significance of its elimination as an independent competitor and substantially diminishes any anticompetitive potential of the transaction.
Opinion 6: Low barriers to entry and recent entry provide additional competitive constraints. Entry and expansion by new marketplace platforms — including Brevity Social Commerce Inc. (launched 2023) and Trove Marketplace Inc. (launched 2024) — and by social commerce and direct-to-consumer aggregators demonstrate low barriers to entry and provide additional competitive constraints that would discipline any attempt by the merged entity to exercise market power. Expansion by existing competitors, including Vertex Commerce Inc. and Nomad Shops LLC, provides further competitive discipline.
D. Materials Reviewed
9. In forming my opinions, I have reviewed an extensive body of materials, including court filings, transaction documents, SEC filings, HSR filing materials, Second Request documents, financial advisor presentations, internal business documents of both Cascade and Pinnacle produced in discovery, industry reports, academic literature on marketplace economics and two-sided platforms, the expert report of the FTC's expert, Dr. Wallace Keenan of Thornfield Research Group, depositions and declarations of fact witnesses, and public information regarding market participants and recent entrants. A complete list of all materials I reviewed in preparing this report is set forth in Exhibit A.
10. I reserve the right to supplement or amend the opinions set forth in this report based on additional information, discovery, or analysis that may become available after the date of this report, including any rebuttal materials submitted by the FTC's expert.
II. BACKGROUND ON THE TRANSACTION AND THE PARTIES
A. Cascade Retail Holdings Inc.
11. Cascade Retail Holdings Inc. ("Cascade") is a Delaware corporation headquartered at 2200 Westlake Avenue North, Suite 3400, Seattle, Washington 98109. Cascade's common stock is listed on the Nasdaq Global Select Market under the ticker symbol "CSRT." As of June 27, 2025, Cascade's market capitalization was approximately $41.2 billion.
12. Cascade was founded in 2003 as a diversified omnichannel retail business. Over the past two decades, Cascade has built a substantial retail enterprise encompassing both physical and digital channels. As of the end of its fiscal year 2024 (ending January 31, 2025), Cascade operated approximately 340 brick-and-mortar retail locations across 38 states, serving a broad consumer base with a wide array of product categories including home goods, electronics, apparel, sporting goods, and general merchandise.
13. In addition to its physical store footprint, Cascade operates a significant direct-to-consumer e-commerce platform, CascadeDirect.com, which has been a core component of Cascade's retail strategy since the mid-2000s. CascadeDirect.com offers consumers the ability to purchase Cascade's own branded and private-label merchandise, as well as products from selected brand partners, directly through Cascade's website and mobile application.
14. Recognizing the growth of the marketplace model in e-commerce, Cascade launched CascadeMarket, a third-party seller marketplace platform, on June 1, 2019. CascadeMarket enables independent sellers to list and sell their products through the Cascade platform, with Cascade providing marketplace infrastructure services including payment processing, search and discovery tools, advertising capabilities, and optional fulfillment services through Cascade's logistics network. CascadeMarket was conceived and developed as a strategic extension of Cascade's existing e-commerce platform, leveraging Cascade's established consumer base, technology infrastructure, and fulfillment capabilities.
15. For fiscal year 2024 (ending January 31, 2025), Cascade reported total revenue of $28.6 billion across all segments. The combined revenue attributable to Cascade's e-commerce and marketplace segments was $9.3 billion. CascadeMarket specifically generated $3.1 billion in GMV through approximately 42,000 active third-party sellers and produced $527 million in marketplace services revenue, reflecting an average take rate of approximately 17% ($527 million / $3.1 billion GMV ≈ 17.0%).
16. Cascade's logistics infrastructure consists of a nationwide fulfillment network of 22 warehouses strategically located across the continental United States. This network enables Cascade to offer competitive delivery speeds and cost-efficient fulfillment to both its direct-to-consumer e-commerce operations and its CascadeMarket sellers. The breadth and scale of this fulfillment network is a critical competitive asset that differentiates Cascade from many online marketplace platforms, which lack integrated fulfillment capabilities.
17. Cascade's total e-commerce GMV — encompassing both CascadeDirect.com and CascadeMarket — was approximately $43.7 billion in fiscal year 2024. This figure reflects the substantial scale of Cascade's overall e-commerce operations, of which CascadeMarket's $3.1 billion in third-party seller GMV represents only a fraction. The FTC's market definition captures only this marketplace GMV component, ignoring the vast majority of Cascade's e-commerce competitive presence.
B. Pinnacle Market Group Inc.
18. Pinnacle Market Group Inc. ("Pinnacle") is a Delaware corporation headquartered at 500 East 6th Street, Suite 800, Austin, Texas 78701. Pinnacle was co-founded in 2014 by Rajiv Chandravar and Lena Kowalski as an online marketplace platform designed to connect independent sellers — particularly artisans, makers, and specialty merchants — with consumers seeking differentiated, unique, and curated products.
19. Pinnacle completed its initial public offering on September 18, 2020, listing its common stock on the Nasdaq Global Select Market under the ticker symbol "PMGI." The IPO was part of a broader wave of marketplace platform offerings during the 2020–2021 period, fueled by the rapid expansion of e-commerce during the COVID-19 pandemic.
20. Pinnacle operates an online marketplace platform that connects independent sellers with consumers across a range of product categories, including home goods, artisanal products, specialty foods, fashion and accessories, and consumer electronics. The platform provides sellers with storefront management tools, payment processing, advertising and promotional services, analytics dashboards, and customer engagement features. Pinnacle does not operate its own fulfillment network and instead relies primarily on sellers to manage their own shipping and fulfillment, although Pinnacle has partnered with several third-party logistics providers to offer optional fulfillment assistance to sellers.
21. For fiscal year 2024 (ending December 31, 2024), Pinnacle reported $11.4 billion in GMV transacted through its platform by approximately 185,000 active sellers. Pinnacle generated $1.82 billion in net revenue, reflecting an average take rate of approximately 16% ($11.4 billion GMV × 16% ≈ $1.824 billion, rounded to $1.82 billion). Pinnacle's revenue is derived from transaction fees charged to sellers on each completed sale, listing fees, advertising and promotional services, and optional value-added services.
22. Pinnacle's pre-announcement market capitalization was approximately $3.9 billion, based on 175,047,319 shares of common stock outstanding and an unaffected closing price of $22.30 per share on March 7, 2025 — the last trading day prior to the period in which market rumors of a potential transaction began to affect Pinnacle's stock price (175,047,319 shares × $22.30 ≈ $3,903,555,414).
C. Transaction Terms
23. On March 14, 2025, Cascade and Pinnacle entered into an Agreement and Plan of Merger (the "Merger Agreement") pursuant to which Cascade agreed to acquire all outstanding shares of Pinnacle common stock in an all-cash transaction. The transaction was publicly announced on March 17, 2025, via simultaneous press releases and a Current Report on Form 8-K filed by Cascade with the Securities and Exchange Commission.
24. Under the terms of the Merger Agreement, Cascade will acquire each outstanding share of Pinnacle common stock for $26.85 per share in cash, without interest, for aggregate merger consideration of approximately $4.7 billion (175,047,319 shares × $26.85 per share ≈ $4,700,020,415). The per-share price of $26.85 represents a premium of approximately 20.4% over Pinnacle's unaffected closing price of $22.30 on March 7, 2025 (($26.85 – $22.30) / $22.30 ≈ 20.4%).
25. The transaction is structured as a reverse triangular merger. CRH Merger Sub Inc. ("Merger Sub"), a Delaware corporation and wholly owned subsidiary of Cascade formed for the purpose of effecting the transaction, will merge with and into Pinnacle, with Pinnacle surviving the merger as a wholly owned subsidiary of Cascade. This structure preserves Pinnacle's corporate existence and contractual relationships while enabling Cascade to acquire full ownership and control.
26. The transaction is to be financed through a combination of (a) approximately $1.9 billion in cash on hand from Cascade's balance sheet and (b) $2.8 billion in borrowings under a senior secured Term Loan B facility provided by Whitmore National Bank, N.A. pursuant to a commitment letter dated March 12, 2025 (Reference No. CRH-WNB-2025-TLB). Cascade has also arranged a $500 million revolving credit facility, which is not expected to be drawn at closing but provides additional financial flexibility.
27. The Merger Agreement contains customary termination provisions, including a reverse termination fee of $282 million (approximately 6% of the aggregate merger consideration) payable by Cascade in the event Cascade fails to consummate the transaction under specified circumstances, and a company termination fee of $164.5 million (approximately 3.5% of the aggregate merger consideration) payable by Pinnacle in the event Pinnacle terminates the Merger Agreement to accept a superior proposal. The magnitude of the reverse termination fee reflects the significant regulatory risk associated with the transaction and the parties' expectation that antitrust review would be the primary obstacle to closing.
28. The outside date for consummation of the transaction is March 14, 2026, subject to automatic extension to June 14, 2026 if the sole unsatisfied closing condition as of the initial outside date is the receipt of required antitrust clearances. This extended outside date reflects the parties' anticipation of a potentially protracted regulatory review process.
D. Regulatory History
29. The parties filed their notification forms under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 ("HSR Act") on April 2, 2025 (Transaction No. HSR-20250402-0347). On May 7, 2025, the Federal Trade Commission issued a Request for Additional Information and Documentary Material (commonly referred to as a "Second Request") to both Cascade and Pinnacle, initiating a detailed investigation of the proposed transaction (File No. 251-0089).
30. Both parties worked diligently to comply with the Second Request. Cascade certified substantial compliance with the Second Request on June 10, 2025. Pinnacle's compliance was certified on the same date. The volume of materials produced in response to the Second Request was substantial, encompassing millions of documents, including internal business documents, financial records, strategic plans, board presentations, and communications relating to competitive strategy, the marketplace business, and the proposed transaction.
31. On June 20, 2025, the Federal Trade Commission issued an Administrative Complaint against Cascade and Pinnacle (Docket No. 9438), alleging that the proposed acquisition, if consummated, would substantially lessen competition in the market for "online marketplace platform services for third-party sellers in the United States" in violation of Section 7 of the Clayton Act, 15 U.S.C. § 18, and Section 5 of the Federal Trade Commission Act, 15 U.S.C. § 45.
32. On June 23, 2025, the FTC filed a Complaint in this Court seeking a temporary restraining order and preliminary injunction to enjoin the proposed transaction pending the outcome of the administrative proceeding, pursuant to Section 13(b) of the FTC Act, 15 U.S.C. § 53(b). The case was assigned to the Honorable Richard A. Johannsen.
33. The Commission's vote to authorize the filing of the Complaint and the administrative action was 3–2, reflecting significant internal division within the Commission regarding the merits of the challenge. The two dissenting Commissioners expressed concerns about the narrowness of the proposed market definition and the strength of the evidence supporting the Commission's theory of harm. This internal division is notable because it suggests that even within the agency, reasonable economists and policy professionals disagree about whether this transaction raises genuine competitive concerns.
III. FRAMEWORK FOR MARKET DEFINITION ANALYSIS
A. Legal and Economic Standards
34. Section 7 of the Clayton Act prohibits mergers and acquisitions "where in any line of commerce or in any activity affecting commerce in any section of the country, the effect of such acquisition may be substantially to lessen competition, or to tend to create a monopoly." 15 U.S.C. § 18. To establish a violation of Section 7, the FTC bears the burden of demonstrating that the proposed transaction is likely to substantially lessen competition in a properly defined relevant market.
35. The definition of the relevant market is a critical threshold inquiry in any merger challenge. The relevant market defines the arena of competition within which the anticompetitive effects of a merger are to be assessed. An improperly defined market — whether too narrow or too broad — will distort the competitive analysis and lead to unreliable conclusions about the likely effects of a transaction. As the Supreme Court recognized in Brown Shoe Co. v. United States, 370 U.S. 294, 325 (1962), the relevant market must correspond to "the commercial realities of the industry."
36. The analytical framework for defining relevant markets in merger cases is well established in economic theory, in the case law, and in the Horizontal Merger Guidelines jointly issued by the Department of Justice and the Federal Trade Commission (the "Merger Guidelines"). The core analytical tool for market definition is the hypothetical monopolist test, also known as the SSNIP (Small but Significant Non-transitory Increase in Price) test.
37. The SSNIP test asks whether a hypothetical profit-maximizing firm that was the only present and future seller of a defined set of products in a defined geographic area would impose at least a small but significant non-transitory increase in price (typically 5–10%) on at least one product in the candidate market. If the hypothetical monopolist would find such a price increase profitable — that is, if the revenue gains from higher prices on retained sales would exceed the revenue losses from sales diverted to products outside the candidate market — then the candidate market is a relevant antitrust market. If the hypothetical monopolist would not find the price increase profitable, because sufficient sales would be diverted to substitutes outside the candidate market, then the candidate market must be expanded to include those substitutes.
38. Market definition analysis considers both demand-side and supply-side substitution. Demand-side substitution measures the extent to which consumers (or, in this case, sellers and buyers on a platform) would switch to alternative products or services in response to a price increase. Supply-side substitution measures the extent to which firms not currently producing the relevant product could readily begin producing it in response to a price increase, thereby expanding supply and constraining the hypothetical monopolist's pricing power. Both forms of substitution are recognized as relevant considerations in defining the boundaries of the relevant market.
B. Two-Sided Platform Considerations
39. Online marketplaces such as CascadeMarket and Pinnacle are multi-sided platforms that serve as intermediaries between at least two distinct user groups — sellers and buyers. The platform creates value by facilitating transactions between these groups, and the platform's economic model depends on attracting and retaining users on both sides simultaneously. This multi-sided nature has important implications for market definition and competitive effects analysis.
40. In Ohio v. Halcyon Corporation, 138 S. Ct. 2274 (2018), the Supreme Court addressed the antitrust analysis of two-sided transaction platforms. The Court held that for two-sided transaction platforms — platforms where the platform facilitates a single, simultaneous transaction between users on each side — "the relevant market must include both sides of the platform." Id. at 2287. The Court explained that "[o]nly other two-sided platforms can compete with a two-sided platform for transactions" and that "[d]efining the relevant market on only one side of the platform . . . leads to 'misleading' results." Id. at 2286 (quoting Filistrucchi et al., Market Definition in Two-Sided Markets: Theory and Practice, 10 J. Competition L. & Econ. 293, 296 (2014)).
41. The implications of Ohio v. Pinnacle Partners LLC for this case are significant. Online marketplaces like CascadeMarket, Pinnacle, Vertex Commerce, and Nomad Shops are quintessential two-sided transaction platforms. They facilitate individual transactions between sellers and buyers, and the value of the platform to each side depends on the participation and behavior of users on the other side. Sellers value a platform with more buyers; buyers value a platform with more sellers and a wider product selection. These indirect network effects are a fundamental feature of marketplace platform economics.
42. The FTC's proposed market definition in this case — "online marketplace platform services for third-party sellers in the United States" — defines the market exclusively from the seller side of the platform. It measures market shares based on seller-side metrics (the volume of GMV transacted by third-party sellers) and assesses competitive harm based on effects on sellers (increased take rates, reduced seller services). This one-sided approach is directly at odds with the Supreme Court's instruction in Ohio v. Pinnacle Partners LLC that the relevant market for a two-sided transaction platform must account for both sides.
43. The failure to account for the buyer side of the platform is not merely a technical deficiency. It introduces systematic bias into the competitive analysis. A platform's ability to raise take rates to sellers is constrained not only by the availability of alternative platforms for sellers but also by the effect of higher take rates on the platform's attractiveness to buyers. Higher take rates may lead sellers to raise prices on the platform, which in turn may cause buyers to shift their purchases to competing platforms or to non-marketplace e-commerce channels. Ignoring this buyer-side constraint overstates the hypothetical monopolist's ability to profitably raise prices and leads to an artificially narrow market definition.
C. Analytical Approach Used in This Report
44. In conducting my market definition analysis, I have employed a comprehensive empirical approach that accounts for both demand-side and supply-side substitution, considers both sides of the marketplace platform, and is grounded in the actual competitive behavior of market participants.
45. Specifically, my analysis includes the following elements:
(a) Demand-side substitution analysis. I have examined the substitution behavior of both sellers and buyers across marketplace platforms, direct-to-consumer e-commerce channels, social commerce platforms, and hybrid retail models. This analysis draws on transaction-level data from Cascade and Pinnacle produced in discovery, industry-level data on e-commerce purchasing patterns, and consumer and seller survey evidence.
(b) Supply-side substitution analysis. I have analyzed the ability of firms not currently operating marketplace platforms to enter the marketplace segment or expand their existing marketplace offerings in response to a price increase. This analysis considers the availability of marketplace technology infrastructure, the capital requirements for marketplace entry, and the historical evidence of entry and expansion in this space.
(c) Cross-elasticity of demand analysis. I have estimated cross-elasticities of demand between marketplace channels and direct retail channels to quantify the degree to which these channels compete for the same transactions. This analysis uses transaction-level data and econometric techniques to measure the responsiveness of marketplace demand to changes in non-marketplace e-commerce prices and service levels, and vice versa.
(d) Econometric analysis. I have conducted econometric analyses using transaction-level data from Cascade, Pinnacle, and industry sources to estimate diversion ratios, price elasticities, and competitive interaction parameters. These analyses inform both the market definition inquiry and the competitive effects assessment.
(e) Seller multi-homing analysis. I have analyzed the extent to which sellers simultaneously maintain presences on multiple platforms and the implications of multi-homing for competitive constraints and market definition. This analysis draws on seller-level data from Pinnacle and CascadeMarket, seller survey evidence, and publicly available information on seller behavior.
46. The detailed results of these analyses are presented in the sections that follow and summarized in the tables and figures attached as Exhibit C.
IV. RELEVANT PRODUCT MARKET DEFINITION
A. The FTC's Proposed Market: "Online Marketplace Platform Services for Third-Party Sellers in the United States"
47. The FTC's Complaint defines the relevant product market as "online marketplace platform services for third-party sellers in the United States." See FTC Complaint ¶¶ 38–45. Under this definition, the relevant market encompasses only those platforms that operate a marketplace model — i.e., platforms that serve as intermediaries facilitating transactions between third-party sellers and consumers, where the platform provides marketplace infrastructure services (such as search, payment processing, and storefront tools) and charges sellers a commission or fee for each transaction.
48. Under this narrow definition, the FTC identifies four "significant participants" in the alleged relevant market, with the following shares based on GMV:
See FTC Complaint ¶ 42; see also Exhibit C, Table 1.
49. Under this market definition, the proposed merger would combine the second-largest participant (Pinnacle, at 30.1%) with the fourth-largest participant (CascadeMarket, at 8.2%), yielding a combined share of 38.3%. The FTC calculates a pre-merger HHI of 2,361, a post-merger HHI of 2,856, and an HHI delta of 495 — figures that exceed the thresholds identified in the Merger Guidelines as creating a presumption of anticompetitive effects. See FTC Complaint ¶ 47.
50. Critically, the FTC's proposed market excludes several significant categories of competitive activity that directly constrain the behavior of marketplace platforms: (1) direct-to-consumer e-commerce, including Cascade's own CascadeDirect.com platform; (2) social commerce platforms that facilitate seller-consumer transactions through social media channels; (3) brick-and-mortar retail, which competes for many of the same consumer transactions; and (4) hybrid retail models that combine elements of direct retail and marketplace intermediation.
51. For the reasons set forth below, the FTC's proposed market definition is artificially narrow, fails the hypothetical monopolist (SSNIP) test, and excludes significant competitive constraints that discipline the behavior of marketplace platforms. The FTC's market definition leads to inflated market shares, inflated HHI calculations, and a fundamentally distorted picture of the competitive landscape.
B. Critique of the FTC's Narrow Market
1. Demand-Side Substitution Is Pervasive
52. The first and most fundamental flaw in the FTC's market definition is its failure to account for pervasive demand-side substitution between marketplace platform transactions and other forms of e-commerce. The evidence demonstrates that both consumers and sellers routinely substitute between marketplace channels and non-marketplace e-commerce channels, and that a hypothetical monopolist of marketplace platform services would be unable to profitably impose a small but significant non-transitory increase in price because of this substitution.
53. Consumer substitution. On the buyer side, consumers do not distinguish between "marketplace" and "non-marketplace" e-commerce when making purchasing decisions. A consumer searching for a kitchen appliance, a piece of home decor, or a pair of running shoes does not confine her search to marketplace platforms. She comparison-shops across a range of channels, including marketplace listings on Pinnacle or CascadeMarket, direct-to-consumer websites operated by brands or retailers, social commerce posts on platforms like Northpoint Services Inc. and Dunmore & Co., and in many cases, brick-and-mortar stores. The consumer's relevant consideration set is defined by the product she seeks, not by the business model of the retail channel through which she might purchase it.
54. Data from Cascade's internal analytics, produced in discovery, confirm this pattern. Cascade's analysis of consumer purchase behavior shows that consumers who purchase products through CascadeMarket also frequently purchase similar products through CascadeDirect.com and through competing direct-to-consumer websites within the same shopping session or within a short time window. These data demonstrate that from the consumer's perspective, marketplace and non-marketplace e-commerce channels are close substitutes.
55. Industry-wide survey evidence further corroborates this finding. A 2024 survey conducted by Meridian Consumer Insights, which I reviewed in preparing this report, found that 72% of consumers who had made a purchase on a marketplace platform in the preceding 90 days had also made a purchase of a similar product category through a direct-to-consumer e-commerce website during the same period. This high rate of cross-channel purchasing is inconsistent with the FTC's claim that marketplace platforms constitute a distinct relevant market.
56. Seller substitution. On the seller side, sellers likewise do not confine their sales activity to marketplace platforms. As discussed in greater detail below, a substantial majority of sellers on Pinnacle and CascadeMarket simultaneously sell through other channels, including their own direct-to-consumer websites, other marketplace platforms, and social commerce platforms. Sellers respond to changes in marketplace platform terms — including take rates, service levels, and listing policies — by shifting sales volume to alternative channels. This seller-side substitution is a direct competitive constraint on marketplace platforms that is ignored by the FTC's one-sided market definition.
57. SSNIP analysis. My analysis demonstrates that a hypothetical monopolist of "online marketplace platform services for third-party sellers in the United States" would not be able to profitably impose a 5% increase in take rates (the relevant "price" variable for marketplace platform services). Such an increase would cause sufficient diversion of both sellers and buyers to direct-to-consumer e-commerce channels, social commerce platforms, and other non-marketplace alternatives to render the price increase unprofitable. The magnitude of the predicted diversion — driven by the high rates of consumer cross-channel shopping and seller multi-homing documented above — is more than sufficient to defeat the FTC's candidate market under the hypothetical monopolist test. This result holds even when the SSNIP test is applied at the 10% level.
2. Supply-Side Substitution Is Readily Available
58. The FTC's narrow market definition also fails to account for the ease with which firms currently operating outside the marketplace segment can enter or expand into marketplace platform services. Supply-side substitution is a recognized basis for expanding the relevant market under the Merger Guidelines, and the evidence of supply-side substitution in this case is compelling.
59. The most striking evidence of supply-side substitution is the history of Cascade's own CascadeMarket. CascadeMarket was launched on June 1, 2019, as an extension of Cascade's existing direct-to-consumer e-commerce platform. Within approximately five years, CascadeMarket grew to $3.1 billion in GMV and approximately 42,000 active third-party sellers, capturing 8.2% of the FTC's narrowly defined market. CascadeMarket's entry demonstrates that a firm with an established e-commerce platform and logistics infrastructure can readily add marketplace functionality and achieve significant scale within a relatively short period. If CascadeMarket is evidence of the ease of entry from adjacent channels, it is inconsistent for the FTC to exclude other firms with similar capabilities from the relevant market.
60. Beyond CascadeMarket, the evidence of supply-side substitution includes the recent entry of social commerce platforms into marketplace intermediation. Brevity Social Commerce Inc., launched in 2023, integrates marketplace functionality into a social media platform, enabling sellers to list products and consummate transactions directly within the social media environment. Trove Marketplace Inc., launched in 2024, entered the curated marketplace space with a focus on pre-owned, vintage, and sustainable goods. Both entrants demonstrate that the technology and business model for marketplace intermediation are accessible to a wide range of firms, not only to incumbents in the narrowly defined marketplace segment.
61. The technology infrastructure required to operate a marketplace platform is widely available through cloud-based Software-as-a-Service ("SaaS") solutions. Companies such as Dunmore Services Inc., Halcyon Systems, and Camberwell Data Systems offer turnkey marketplace technology platforms that enable any retailer or technology company to launch marketplace functionality with relatively modest investment. This widespread availability of marketplace-enabling technology further supports the conclusion that supply-side substitution into the marketplace segment is timely, likely, and sufficient — and that the FTC's narrow market definition fails to account for this competitive constraint.
3. Seller Multi-Homing Undermines the Narrow Market
62. A further critical flaw in the FTC's market definition is its failure to account for the pervasive practice of seller multi-homing — the simultaneous maintenance of seller presences on multiple platforms and channels. Multi-homing is a fundamental feature of the online marketplace ecosystem, and it has important implications for market definition and competitive effects analysis.
63. My analysis of seller-level data from Pinnacle and CascadeMarket demonstrates that multi-homing is the norm, not the exception. Approximately 68% of Pinnacle sellers also sell through at least one other channel, including direct-to-consumer websites, Vertex Commerce, Nomad Shops, CascadeMarket, and social commerce platforms. Similarly, approximately 74% of CascadeMarket sellers sell through at least one other channel. These rates of multi-homing are based on seller survey data, cross-platform matching of seller identifiers, and analysis of seller transaction patterns.
64. The high prevalence of seller multi-homing has two important implications for market definition. First, it demonstrates that sellers view marketplace platforms and alternative channels as substitutes — they simultaneously participate in multiple channels and can readily shift sales volume between them. This is direct evidence of demand-side substitution on the seller side that undermines the FTC's claim that marketplace platforms constitute a distinct relevant market.
65. Second, multi-homing reduces the switching costs that sellers face when responding to changes in marketplace platform terms. A seller who is already active on multiple platforms does not need to invest in building a new storefront, establishing a new customer base, or learning a new set of tools when shifting sales volume from one platform to another. The incremental cost of redirecting sales is low, which means that marketplace platforms face a highly elastic seller demand curve — precisely the condition that defeats a candidate market under the hypothetical monopolist test.
4. The FTC's Market Excludes the Primary Competitive Constraint
66. Perhaps the most significant distortion introduced by the FTC's narrow market definition is its exclusion of Cascade's direct-to-consumer e-commerce business from the relevant market. Cascade's total e-commerce GMV — encompassing both CascadeDirect.com and CascadeMarket — was approximately $43.7 billion in fiscal year 2024. Of this total, CascadeMarket's third-party seller GMV of $3.1 billion represents only approximately 7.1%.
67. Pinnacle's GMV of $11.4 billion, while substantial in absolute terms, is dwarfed by Cascade's total e-commerce footprint of $43.7 billion. Yet the FTC's market definition captures only the $3.1 billion CascadeMarket GMV and the $11.4 billion Pinnacle GMV, ignoring the $40.6 billion in Cascade DTC e-commerce sales that directly compete for many of the same consumer transactions.
68. The practical effect of this exclusion is to artificially inflate the competitive significance of the CascadeMarket-Pinnacle combination. In the FTC's narrow market, the combined entity appears to have a 38.3% share; in the broader e-commerce market, its share is approximately 7.3%. The FTC's approach treats CascadeDirect.com — which sells many of the same product categories as Pinnacle and CascadeMarket sellers and competes directly for the same consumer purchases — as though it operates in an entirely separate market. This treatment is inconsistent with economic reality, with the evidence of consumer substitution behavior, and with the Supreme Court's instruction that market definition must reflect "commercial realities."
C. The Correct Market: "All E-Commerce Retail in the United States"
69. Properly accounting for demand-side and supply-side substitution, and properly treating both sides of the marketplace platform, the relevant product market in this case is "all e-commerce retail in the United States." This market encompasses the full range of retail transactions facilitated through internet-based channels, including:
(a) marketplace platform transactions, in which third-party sellers transact with consumers through an intermediary platform;
(b) direct-to-consumer e-commerce, in which retailers and brands sell directly to consumers through their own websites and mobile applications;
(c) social commerce, in which transactions are facilitated through social media platforms;
(d) hybrid retail with online ordering, in which traditional retailers offer online purchasing with options for home delivery or in-store pickup; and
(e) any other retail transactions facilitated through internet-based channels.
70. Total U.S. e-commerce GMV in 2024 was approximately $757 billion, according to industry estimates from the U.S. Census Bureau and leading e-commerce research firms. This figure encompasses all of the categories described above and represents the total addressable market within which marketplace platforms, direct-to-consumer retailers, social commerce platforms, and hybrid retailers compete for consumer transactions.
71. Under this properly defined market, the combined Cascade and Pinnacle share of total U.S. e-commerce GMV is as follows:
• Marketplace GMV only (CascadeMarket + Pinnacle): $14.5 billion ($3.1 billion + $11.4 billion) / $757 billion = approximately 1.9%.
• Including Cascade's total e-commerce GMV: $55.1 billion ($43.7 billion + $11.4 billion) / $757 billion = approximately 7.3%.
72. Under either calculation, the combined entity's share of the relevant market is far below any presumptive threshold of competitive concern recognized in the Merger Guidelines or in the case law. The Merger Guidelines identify markets with a post-merger HHI below 1,500 as "unconcentrated," and mergers in unconcentrated markets are "unlikely to have adverse competitive effects." In the "all e-commerce retail" market, the post-merger HHI is well below 1,500, and the HHI delta attributable to the transaction is de minimis.
73. The market shares and HHI calculations under the properly defined market are summarized in Exhibit C, Tables 2 and 3.
D. Geographic Market
74. Both the FTC and the Defendants agree that the relevant geographic market in this case is the United States. I concur with this assessment. CascadeMarket and Pinnacle both operate as nationwide platforms, serving sellers and consumers throughout the United States. The competitive conditions that govern marketplace platform behavior — including take rates, seller services, consumer pricing, and logistics capabilities — are generally uniform across the country. Accordingly, the geographic scope of the relevant market does not present a contested issue, and my analysis focuses on the definition of the relevant product market.
V. COMPETITIVE EFFECTS ANALYSIS
A. The FTC's Theory of Harm
75. The FTC alleges that the proposed acquisition of Pinnacle by Cascade would substantially lessen competition in the market for "online marketplace platform services for third-party sellers in the United States" by combining two of the four significant participants in that market. Specifically, the FTC alleges that the merger would eliminate head-to-head competition between CascadeMarket and Pinnacle, enabling the merged entity to exercise market power over third-party sellers through: (1) increased take rates; (2) reduced seller services; and (3) diminished innovation in marketplace features and functionality. The FTC further alleges a "trend toward concentration" in online marketplaces that the proposed transaction would exacerbate.
76. For the reasons set forth below, the FTC's theory of harm is unsupported by the evidence and is based on a fundamentally flawed market definition. When the transaction is assessed within the properly defined relevant market — or even within the FTC's narrow market, when competitive dynamics are properly accounted for — the evidence does not support a conclusion that the merger is likely to substantially lessen competition.
B. Market Concentration Analysis
1. HHI Under the FTC's Narrow Market
77. The FTC's HHI calculations are derived from the market share figures set forth in the FTC Complaint at paragraph 42. Using those shares, the FTC calculates:
• Pre-merger HHI: 8.2² + 30.1² + 35.7² + 14.6² + (distributed "all others" at 11.4%) = approximately 2,361
• Post-merger HHI: 38.3² + 35.7² + 14.6² + (distributed "all others" at 11.4%) = approximately 2,856
• HHI Delta: 2 × 8.2 × 30.1 = 493.64 ≈ 495 (reflecting rounding in the underlying share figures)
78. Under the Merger Guidelines, a post-merger HHI exceeding 2,500 with a delta above 200 is identified as creating a presumption that the merger "is likely to enhance market power." The FTC's HHI figures exceed these thresholds.
79. However, the probative value of these HHI calculations depends entirely on the correctness of the underlying market definition. As I have demonstrated in Section IV above, the FTC's proposed market is artificially narrow, fails the hypothetical monopolist test, and excludes significant competitive constraints. The HHI figures of 2,361 and 2,856 are artifacts of this improperly gerrymandered market — they are products of the market definition, not measures of genuine competitive conditions.
80. Even within the FTC's narrow market, the HHI calculations require careful contextualization. The Merger Guidelines recognize that HHI thresholds are starting points for analysis, not dispositive conclusions. A post-merger HHI above 2,500 creates a rebuttable presumption that may be overcome by evidence that the transaction is unlikely to enhance market power despite the concentration metrics. As discussed below, the evidence in this case — including pervasive multi-homing, low barriers to entry, recent entry, competitive fringe, and the weakening competitive position of Pinnacle — rebuts any presumption that might be drawn from the FTC's HHI calculations.
2. HHI Under the Correct Broader Market
81. Under the properly defined "all e-commerce retail in the United States" market, the combined entity's share is approximately 7.3%. In this market, hundreds of competitors — including major retailers with substantial e-commerce operations, pure-play e-commerce companies, social commerce platforms, and specialty online retailers — collectively account for the vast majority of the $757 billion in total U.S. e-commerce GMV. Even attributing generous shares to the largest competitors, the post-merger HHI in this market is well below 1,500, firmly in the "unconcentrated" range identified in the Merger Guidelines.
82. The HHI delta attributable to the transaction in the broader market is de minimis — on the order of a few points. Under the Merger Guidelines, mergers in unconcentrated markets are "unlikely to have adverse competitive effects and ordinarily require no further analysis."
83. A comparison of the HHI calculations under the FTC's narrow market and the properly defined broader market is set forth in Exhibit C, Table 3. The dramatic difference in concentration metrics — from a "highly concentrated" market under the FTC's definition to an "unconcentrated" market under the proper definition — illustrates the extent to which the FTC's competitive concerns are driven by its market definition choices rather than by genuine competitive conditions.
3. Market Shares Are Misleading in a Dynamic Digital Market
84. Even if the FTC's narrow market definition were accepted arguendo, static market shares would be a poor predictor of competitive effects in this industry. Online marketplace platforms operate in a rapidly evolving digital environment characterized by frequent entry, technological innovation, shifting consumer preferences, and volatile competitive positions. Market shares in such environments are inherently unstable and reflect past competitive outcomes rather than future competitive constraints.
85. The history of CascadeMarket itself illustrates this point. CascadeMarket launched on June 1, 2019, with zero market share. Within approximately five years, it grew to 8.2% of the FTC's narrowly defined market — $3.1 billion in GMV and 42,000 active sellers. This trajectory demonstrates that market positions in the marketplace segment can change dramatically within a short period, and that current market shares may not reliably predict future competitive conditions.
86. Similarly, Pinnacle's share has been declining as its growth rate decelerates. Pinnacle's GMV growth rate has fallen from 28% YoY in 2022 to 9% YoY in 2024. If this trend continues, Pinnacle's share of the marketplace segment will decline further, even absent the proposed merger. Static market shares, calculated at a single point in time, fail to capture this dynamic trajectory and overstate Pinnacle's competitive significance going forward.
C. Unilateral Effects Analysis
1. Closeness of Competition
87. The FTC's unilateral effects theory rests on the premise that CascadeMarket and Pinnacle are close competitors whose head-to-head competition would be eliminated by the merger. Under standard unilateral effects analysis in differentiated product markets, the magnitude of predicted unilateral effects depends critically on the closeness of competition between the merging parties — specifically, the extent to which each party constrains the other's pricing and service decisions relative to other competitors.
88. My analysis of the competitive positioning of CascadeMarket and Pinnacle indicates that while they serve overlapping customer segments, they are significantly differentiated in ways that limit their closeness of competition. CascadeMarket is primarily positioned as a complement to Cascade's existing retail ecosystem. It leverages Cascade's brand recognition, consumer traffic, and fulfillment infrastructure to offer sellers access to Cascade's established customer base. CascadeMarket's product mix is heavily weighted toward the same categories in which Cascade's physical and DTC operations are strongest — home goods, electronics, and general merchandise.
89. Pinnacle, by contrast, was founded as a platform for independent artisans, makers, and specialty sellers. Its seller base and product mix are oriented toward differentiated, curated, and niche products — artisanal goods, specialty foods, handmade fashion, and unique home decor. While Pinnacle has expanded into broader product categories in recent years, its core identity and value proposition remain distinct from CascadeMarket's mass-retail-adjacent positioning.
90. This differentiation is reflected in the diversion ratios between the merging parties. My analysis of actual seller transaction data — including sellers' responses to changes in take rates and service levels on individual platforms — indicates that the diversion ratio from Pinnacle to CascadeMarket is substantially lower than the diversion ratio from Pinnacle to Vertex Commerce. That is, when Pinnacle sellers reduce their activity on Pinnacle or leave the platform entirely, the primary beneficiary is Vertex Commerce, not CascadeMarket. This finding is consistent with the competitive positioning of the platforms: Vertex Commerce, as the largest marketplace platform, offers a broad seller base and consumer reach that is a closer substitute for Pinnacle than CascadeMarket's more limited marketplace offering.
91. The diversion ratio analysis is summarized in Exhibit C, Figure 1. The relatively low diversion ratio between the merging parties — compared to diversion between Pinnacle and Vertex Commerce, and between Pinnacle and direct-to-consumer channels — indicates that CascadeMarket is not Pinnacle's closest competitor and that the competitive constraint eliminated by the merger is modest relative to the constraints imposed by Vertex Commerce, Nomad Shops, and the broader e-commerce ecosystem.
2. Upward Pricing Pressure Analysis
92. I have conducted a Gross Upward Pricing Pressure Index ("GUPPI") analysis to assess the predicted price effects of the merger on take rates charged to sellers. The GUPPI methodology, which is discussed in the Merger Guidelines as an indicator of unilateral incentives to raise prices post-merger, calculates the value of diverted sales recaptured by the merger partner, expressed as a proportion of the pre-merger price.
93. The GUPPI analysis indicates that the predicted upward pricing pressure from the merger is minimal. The low diversion ratios between CascadeMarket and Pinnacle — reflecting their differentiated competitive positions — translate into low GUPPI values that fall well below the levels typically associated with competitive concern. The detailed GUPPI results are presented in Exhibit C, Figure 2.
94. Moreover, any upward pricing pressure that might exist is offset by two countervailing forces. First, the efficiencies generated by the merger — discussed in detail in Section VII below — create downward pricing pressure by reducing the merged entity's costs of serving sellers. Second, the competitive constraints imposed by Vertex Commerce (35.7% share in the FTC's market), Nomad Shops (14.6%), and the competitive fringe (11.4%, including new entrants) limit the merged entity's ability to profitably raise take rates. Sellers facing a take-rate increase would divert volume to these alternatives, eroding the profitability of any price increase.
3. Multi-Homing Constrains Unilateral Effects
95. The pervasive practice of seller multi-homing — documented in Section IV.B.3 above — provides an additional and significant constraint on unilateral effects. When approximately 68% of Pinnacle sellers and 74% of CascadeMarket sellers already maintain presences on multiple platforms, the merged entity's ability to raise take rates or reduce service levels is severely constrained. Multi-homing sellers can redirect sales volume to alternative platforms without incurring the costs of establishing a new platform presence, because they already have one.
96. Consider the scenario posited by the FTC: that the merged entity would increase take rates for sellers on the combined platform. In a world where sellers are single-homed — i.e., they sell exclusively on the merged platform — such a take-rate increase might be profitable because the switching costs for sellers would be high. But in a world where the vast majority of sellers are already active on multiple platforms, the take-rate increase would cause an immediate and measurable diversion of seller activity to Vertex Commerce, Nomad Shops, direct-to-consumer channels, and social commerce platforms. This diversion would reduce the merged entity's transaction volume, advertising revenue, and overall platform value, making the take-rate increase unprofitable.
97. Buyer multi-homing further constrains the merged entity's pricing power. Consumers are not locked into any single marketplace platform; they routinely comparison-shop across platforms and channels. If the merged entity's take-rate increase causes sellers to raise prices on the platform or to divert their best products and inventory to competing platforms, consumers will follow the value — purchasing on Vertex Commerce, Nomad Shops, direct-to-consumer websites, or social commerce platforms where prices are lower or product selection is better. The loss of buyer traffic, in turn, would reduce the platform's value to sellers, creating a negative feedback loop that further constrains the merged entity's ability to exercise market power.
D. Coordinated Effects Analysis
98. In addition to unilateral effects, the FTC's competitive effects theory may also encompass concerns about coordinated effects — the possibility that the merger would make it easier for the remaining firms in the marketplace segment to coordinate their behavior, either through explicit agreement or through tacit coordination facilitated by the merger's reduction in the number of significant competitors.
99. Under the FTC's narrow market definition, the post-merger marketplace segment would have three significant firms: the combined Cascade-Pinnacle entity (38.3%), Vertex Commerce (35.7%), and Nomad Shops (14.6%), along with a competitive fringe accounting for 11.4% of the market. The reduction in the number of significant competitors from four to three could, in theory, facilitate coordinated behavior by reducing the complexity of coordination and making it easier for firms to monitor and enforce coordinated outcomes.
100. However, my analysis indicates that coordinated effects are unlikely for several reinforcing reasons:
(a) High product differentiation. The marketplace platforms in this segment are highly differentiated in their seller bases, category focus, consumer demographics, and value propositions. Vertex Commerce operates as a broad-based marketplace with a focus on scale and category breadth; Pinnacle has historically focused on artisanal and specialty

UNITED STATES DISTRICT COURT WESTERN DISTRICT OF WASHINGTON SEATTLE DIVISION

I. INTRODUCTION AND SUMMARY OF OPINIONS

II. BACKGROUND ON THE TRANSACTION AND THE PARTIES

III. FRAMEWORK FOR MARKET DEFINITION ANALYSIS

IV. RELEVANT PRODUCT MARKET DEFINITION

V. COMPETITIVE EFFECTS ANALYSIS

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Parties

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