This article seeks an answer to a question that should be well settled: for purposes of antitrust analysis, what is 'market power' and/or 'monopoly power'? The question should be well settled because antitrust law requires proof of actual or likely market power or monopoly power to establish...

This note describes the implementation of the hypothetical monopolist ssnip test for market definition in the context of merger cases where firms produce multiple differentiated products. The test developed here represents an extension and generalization of the Katz-Shapiro and...

We examine the role of private information on the impact of vertical mergers. A vertical merger can improve the information that is available to an upstream monopolist because, after the merger, the monopolist can observe the cost of its downstream merger partner. In the pre-merger world,...

This paper formulates a rigorous rule of reason legal standard under Section 2 of the Sherman Act for refusals to deal and price squeezes undertaken by an unregulated, vertically integrated monopolist against actual or potential competitors. This rule of reason standard is administrable by the...

This paper examines a number of issues in the economics and law of leverage and monopolization through the lens of the Microsoft case. The paper explains how Microsoft's practices can be divided into two categories -- exclusivity and incompatibility. This exclusionary conduct has the effect of...

This short note prepared for an OECD meeting in June 2021 examines several antitrust issues involving analysis of potential competition. While the analysis is not new, it is still useful to collect them together in a unified fashion to show how they are related. In this regard, all the analysis...