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Economists for Meta, advertisers debate social media ad definitions in US court case

By Mike Swift ( June 5, 2025, 23:33 GMT | Insight) -- Economists for Meta Platforms and a group of advertisers who bought ads on Facebook and its other social media platforms tangled before a federal judge today in a often-spirited debate over how to define the antitrust market for ads on social media platforms. Michael Williams, an expert witness for the plaintiffs, and Catherine Tucker, an expert for Meta, differed sharply over market definitions and Williams' method for estimating Meta's alleged illegal overcharge of advertisers, in a session in which US District Judge James Donato asked questions and let the economists debate the answers.Economists for Meta Platforms, alongside those for advertisers who say the tech giant collected an illegal 30.1 percent overcharge on ads through its monopoly of the social media ad market, hotly debated their theories before a federal judge today in what could be a pivotal clash....

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