This paper analyzes dynamic cartel formation and antitrust enforcement when firms operate in demand-related markets. We show that cartel prosecution can have a knock-on effect: desisting a cartel in one market reduces profits and cartel stability and leads to the break-up of the cartel in the...

We analyze horizontal mergers when the acquirer holds a passive partial ownership stake (PPO) in the target firm prior to the merger. We show that a PPO reduces the minimal synergy level necessary to make a merger beneficial for consumers. It follows that an antitrust authority ignoring existing...

Antitrust is back in vogue at the U.S. Supreme Court. Whereas the Rehnquist Court decided few antitrust cases in its latter years (only one from 1993 to 1995, one each year from 1996 through 1999, and none from 2000 to 2003), the Roberts Court issued seven antitrust decisions in its first two...

We build a model of tacit collusion between firms that operate in multiple markets to study the effects of trade costs. A key feature of the model is that cartel discipline is endogenous. Thus, markets that appear segmented are strategically linked via the incentive compatibility constraint....

This paper analyzes dynamic cartel formation and antitrust enforcement when firms operate in demand-related markets. We show that cartel prosecution can have a knock-on effect: desisting a cartel in one market reduces profits and cartel stability and leads to the break-up of the cartel in the...

Has the antitrust arsenal run out of novel theories or weapons? Think again. Recent scholarship has come to challenge conventional wisdom with the latest target of antitrust imagination being institutional investors, including diversified index funds. New economic research suggests that common...

In dozens of cases each year alleging horizontal price fixing and other per se violations of Section 1 of the Sherman Act, the central issue is whether the defendants ever formed an agreement. One source of uncertainty in resolving this issue in litigation is the meaning of “tacit...

Many cartels are formed by individual managers of different firms, but not by firms as collectives. However, most of the literature in industrial economics neglects individuals' incentives to form cartels. Although oligopoly experiments reveal important insights on individuals acting as firms,...

Do mergers help or hinder collusion? This paper studies the stability of the vitamin cartels in the 1990s and presents a repeated-games approach to quantify "coordinated effects" of a merger. We use data and direct evidence from American courts and European agencies to show the incentive...

A bundled discount occurs when a seller charges less for a bundle of goods than for its components when sold separately. A characteristic of such discounting is that a rival who makes only one of the products in the bundle may have to give a larger per item discount in order to compensate the...