Antitrust commentators widely regard the prohibition on price fixing as the most settled and economically sound area of antitrust. Whinston's discussion seeks to unsettle this view, suggesting that some fundamental issues in this area are, in fact, not well understood. In his discussion of horizontal mergers, Whinston describes the substantial advances in recent theoretical and empirical work and suggests fruitful directions for further research. The complex area of exclusionary vertical contracts is perhaps the most controversial in antitrust. The influential Chicago School cast doubt on arguments that vertical contracts could be profitably used to exclude rivals. Recent theoretical work, to which Whinston has made important contributions, instead shows that such contracts can be profitable tools for exclusion. Whinston's discussion sheds light on the controversy in this area and the nature of those recent theoretical contributions.
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