This Essay describes an approach for designing antitrust rules for assessing whether firms have engaged in anticompetitive unilateral practices that is based in part on the error-cost framework pioneered by Judge Easterbrook. We focus particularly on the role of economic theory and evidence in...

The recent article by Maurits Dolmans and Thomas Graf summarizes their views on the analytical framework adopted under EC tying law and applies this framework to the European Commission's March 2004 decision in Microsoft. We appreciate the opportunity this article provides for engaging in a...

Firms may be able to create new and improved products as a result of merging. These "demand-side efficiencies" should be considered by competition authorities in considering whether to allow a merger. Unlike reductions in costs that merged firms may not pass on to consumers, new and better...

We describe the main features of U.S. and E.C. tying law and consider their recent evolution. We then review the economic literature on tying and summarize its main implications for the analysis of tying cases: First, recent advances in economic theory unambiguously endorse a rule-of-reason...

Firms may be able to create new and improved products as a result of merging. These "demand-side efficiencies" should be considered by competition authorities in considering whether to allow a merger. Unlike reductions in costs that merged firms may not pass on to consumers, new and better...