Assessing the Effects of Antitrust Enforcement in the United States

This article reviews empirical evidence informing an assessment of cartel and merger antitrust enforcement in the United States and makes some reasonable inferences from it. It also explains why an objective assessment based on hard evidence is not possible for the critical deterrence effects of enforcement, or for any of the effects of enforcement against single-competitor exclusionary conduct. Finally, this article describes the reporting by the U.S. Department of Justice of consumer savings from its antitrust enforcement actions, and details the construction of the savings estimates from cartel and horizontal merger enforcement.