The Yale Law Journal

Aaron M. Panner

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Market Definition and Anticompetitive Effects in Ohio v. American Express

Aaron M. Panner

With high-tech industries attracting increased scrutiny, the Supreme Court’s analysis of the two-sided market in Ohio v. American Express will be a focus of antitrust litigation.  This Essay argues that, despite the apparent focus on market definition, the Court’s opinion is most persuasive in its c…