This work offers a critical evaluation of the Chicago approach to antitrust. Judgements by the United States Supreme Court (in cases such as Kodak) and the debate surrounding the Microsoft monopoly have led to the view that antitrust has entered the post-Chicago era, in which previous immoderations are tempered, and more refined and accurate analyses take precedence. This claim is made at a time when European competition policy is gradually embracing an economics-based approach. The authors discuss the economic foundations of competition policy and the different ways in which both American...