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University of Miami Law School

Business Organizations Law

American Express

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Market Power And American Express, John B. Kirkwood Apr 2018

Market Power And American Express, John B. Kirkwood

University of Miami Business Law Review

The Second Circuit ruled that American Express did not have market power because it operated in a two-sided market and any leverage it exercised over merchants derived from its successful competition for cardholders. As a result, the relevant market had to include both sides of a credit card transaction, the company’s market share was modest, and it could not exploit both merchants and cardholders. In Market Power and Antitrust Enforcement (forthcoming in B.U. L. REV.), I propose a new approach that infers market power from the likely effects of the challenged conduct. This approach shows that American Express ...