Amazon Price Inflation Lawsuit Gains Class Action Status For eBay, Walmart Buyers
Amazon is facing a certified class action lawsuit over allegations its pricing policies artificially inflated prices paid by millions of consumers shopping on competing marketplaces like eBay and Walmart, after a federal judge rejected the company's objections to class certification.
U.S. District Judge John H. Chun granted class certification October 9 in a 56-page order made public November 2, finding plaintiffs had presented sufficient evidence of an alleged companywide anti-discounting policy to pursue their claims collectively. The lawsuit, originally filed in March 2020, alleges Amazon used its dominant marketplace position to discourage sellers from offering lower prices on competing websites, even when lower selling fees could allow them to pass savings along to buyers without reducing their own profit margins.
Plaintiffs estimated the proposed class included at least 10 million consumers based on Amazon transaction data, though the judge narrowed eligibility to U.S. buyers who, since March 19, 2016, made at least four qualifying purchases on eBay or two on Walmart Marketplace. Those purchases must involve new, physical products concurrently offered by the same third-party seller on Amazon and monitored through Amazon's competitive pricing systems, leaving the final size of the certified class uncertain.
Until March 2019, Amazon's seller agreement included an explicit price parity provision requiring merchants to ensure that prices and other purchase terms offered through their own websites or other online sales channels were at least as favorable for Amazon customers. The company removed that contractual requirement amid antitrust scrutiny, but plaintiffs contend it continued effectively enforcing the same restrictions through a combination of other seller policies, automated price monitoring and the threat of losing Featured Offer or Buy Box eligibility on Amazon.
One of the primary mechanisms identified in the case is Amazon's Select Competitor-Featured Offer Disqualification algorithm (SC-FOD), introduced in 2015 and expanded to all product categories by 2016. According to the plaintiffs, the system monitors prices on competing retail websites and can remove Buy Box eligibility when it finds a lower price elsewhere. Plaintiffs say Amazon notifies sellers when their prices are even one cent higher than the lowest external price detected, directing them to lower their Amazon prices to regain eligibility and encouraging the use of automated repricing tools.
Amazon disputes the characterization of SC-FOD as a price parity enforcement mechanism, arguing that it compares prices against a limited group of established retailers, typically large national chains, rather than individual third-party merchants. The company maintains that sellers who lose Featured Offer eligibility can generally restore it by lowering their prices on Amazon without changing prices elsewhere, and that the system is intended to ensure competitive offers for Amazon customers.
For sellers operating across multiple marketplaces, the alleged restrictions can have financial consequences beyond Amazon itself. Selling fees and other costs vary between platforms, meaning a merchant may be able to offer a product for less on eBay, Walmart or their own website while maintaining the same profit margin.
But if offering that discount risks losing Buy Box eligibility on Amazon, sellers may instead keep prices higher on competing channels to protect their Amazon sales. Plaintiffs argue this creates an artificial price floor that limits competition and forces consumers to pay more even when they never shop on Amazon.
Plaintiffs also point to Amazon's Marketplace Fair Pricing Policy, Seller Code of Conduct and Amazon Standards for Brands as evidence that the company continued restricting off-platform discounts after eliminating its explicit contractual parity requirement. The Fair Pricing Policy allows Amazon to suppress Buy Box eligibility, remove listings or suspend selling privileges for certain pricing practices, including prices significantly higher than recent offers on or off Amazon.
A November 2021 clarification to the Seller Code of Conduct also identifies off-Amazon rebates and discounts designed to drive customers to products sold without those incentives on Amazon as violations. Amazon disputes that these policies impose price parity, arguing the Fair Pricing Policy is intended to prevent price gouging and the 2021 clarification addresses manipulation of search rankings rather than restricting off-platform prices.
Judge Chun found that plaintiffs had presented substantial evidence of standardized contractual requirements, corporate policies and enforcement practices supporting their claims of a companywide anti-discounting policy.
Plaintiffs' evidence suggests that Amazon operates under a general policy of price parity via its contractual agreements with sellers and its company-level understanding of what those agreements entail.
Amazon argued that its original price parity requirement was rarely enforced and that subsequent policies affected only a limited percentage of sellers and products. But Chun found that incomplete monitoring did not necessarily mean Amazon wasn't consistently enforcing its policies against violations it discovered, noting that the company had not identified examples in which it detected a price parity or price competitiveness violation and chose not to take action.
The alleged impact of Amazon's pricing restrictions on competing marketplaces has also been central to separate antitrust challenges brought by federal and state regulators. The Federal Trade Commission and 17 states sued Amazon in September 2023, accusing the company of using anti-discounting measures and other practices to maintain monopoly power, suppress competition and keep prices artificially high across the internet.
Liz Morton
In March 2026, California Attorney General Rob Bonta sought a preliminary injunction against Amazon's pricing practices, citing evidence gathered through discovery that allegedly showed the company pressuring sellers and vendors to raise prices on competing marketplaces, remove discounted listings or maintain pricing parity. Amazon has denied wrongdoing, arguing its pricing policies are lawful and benefit consumers.
Amazon also challenged the economic analysis presented by plaintiffs' expert Parag Pathak, arguing his model relies on theoretical assumptions that cannot reliably establish whether individual consumers suffered harm. Pathak used Amazon transaction data and analyses of marketplace fee changes to assess the impact of the alleged pricing restrictions, estimating that fewer than 5% of consumers in the original proposed class were uninjured. Judge Chun found the methodology sufficiently reliable for class certification, leaving disputes over its accuracy and conclusions for later proceedings.
The company is now seeking permission to appeal the ruling to the Ninth Circuit, where four economists submitted a proposed amicus brief October 30 questioning the use of theoretical economic models without sufficient testing against real-world evidence. The economists say they have not independently examined the case record and take no position on whether certification was appropriate or whether Amazon violated antitrust laws.
The Frame-Wilson lawsuit adds another potential source of liability for Amazon's alleged pricing restrictions, seeking damages on behalf of eBay and Walmart customers who may have paid inflated prices on transactions conducted entirely outside Amazon's marketplace.
The case is Frame-Wilson et al. v. Amazon.com Inc., No. 2:20-cv-00424, in the U.S. District Court for the Western District of Washington. Amazon's petition for permission to appeal is pending before the Ninth Circuit under No. 26-7108.
