An EC Green Paper in 2005 asked for comments on an array of possible reform measures aimed at encouraging private antitrust damage actions in the national courts of the EC’s member states. One of the questions the Green Paper raised was “how should damages be defined?” Should they be...

Oligopolists look for signals from one another in planning their strategies. Some signals solicit cooperation from rivals and a still smaller number succeed in achieving noncompetitive equilibria. But only a subset of these noncompetitive outcomes involve agreements under Section 1 of the...

Antitrust remedies -- criminal and civil, public and private, penalties and injunctions -- are supposed to “eliminate the effects of the illegal conduct” and “restore competition.” In pursuing these goals, courts and enforcers are guided by the standard of economic efficiency and by...

In this article, first published in 17 Managerial & Decision Econ. 127 (1996), we show how economic theory guides the courts' determinations of which harms from collusive and exclusionary practices constitute antitrust injury

This article, published in 1991, describes the two great ideologies of the market and the state that shaped antitrust law at its inception. In the evolutionary vision, market outcomes are spontaneous and unintended results of countless interactions of self-interested individuals; the resulting...

Aspen Skiing v. Aspen Highlands Skiing has had theoretical importance for antitrust law far out of proportion to the trivial dispute it resolved. It has divided adherents of the Chicago and Post-Chicago Schools, providing a useful vehicle for considering the proper goals of antitrust. And it has...

In a 2013 opinion in Microsoft v. Motorola, Judge James Robart calculated “reasonable and nondiscriminatory” or RAND royalties that Motorola could lawfully charge Microsoft for licenses to use Motorola patents that were essential to two industry standards. Although the case involved only a...

This article, published in 2001, considers the appropriate standards for monopolization cases in which the defendant has allegedly reduced innovation by refusing to deal with the plaintiffs. We note that claims of reduced innovation are problematic, particularly in dynamic markets, because...

This article, published in 1987, responds to John Shepard Wiley, A Capture Theory of Antitrust Federalism, 99 Harv. L. Rev. 713 (1986). In an earlier article, I argued that the "clear articulation" requirement is the best criterion for "state action" antitrust immunity because it reinforces...