United States antitrust policy is said to promote some version of economic welfare. Antitrust promotes allocative efficiency by ensuring that markets are as competitive as they can practicably be, and that firms do not face unreasonable roadblocks to attaining productive efficiency, which refers...

This brief essay addresses the ambiguities in the meaning of “consumer welfare” in antitrust, exploring the differences between the Williamson, Bork, and current understanding of that term. After weighing the alternatives it argues that the consumer welfare principle in antitrust should seek...

Since the Supreme Court's landmark 1963 decision in Philadelphia National Bank, antitrust challengers have mounted prima facie cases against horizontal mergers that rested on the level and increase in market concentration caused by the merger, with proponents of the merger then permitted to...