Law Commons^™

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 clearly exercised …