An antitrust authority deters collusion using fines and a leniency program. Unlike in most of the earlier literature, our firms have imperfect cumulative evidence of the collusion. That is, cartel conviction is not automatic if one firm reports: reporting makes conviction only more likely, the...

An antitrust authority deters collusion using fines and a leniency program. It chooses the probability of an investigation. Firms pick the degree of collusion: The more they collude, the higher are profits, but so is the probability of detection. Firms thus trade-off higher profits against...

To encourage private actions for damages in antitrust cases some jurisdictions subtract a fraction of the redress from the fine. We analyze the effectiveness of this policy. Such a rebate does not encourage settlement negotiations that would otherwise not occur. If, however, the parties settle...

This paper proposes an understanding of abuse of collective dominance or shared monopolization that does not outlaw oligopolistic tacit collusion as such, but that reputes abusive a set of tactics adopted by tacitly colluding oligopolists exposed to disruption. As much as deviation is an...

An antitrust authority deters collusion using fines and a leniency program. It chooses the probability of an investigation. Firms pick the degree of collusion: The more they collude, the higher are profits, but so is the probability of detection. Firms thus trade-off higher profits against...

Patent settlements between rivals restrain competition in many different ways. Antitrust requires that their anticompetitive effects are reasonably commensurate with the firms’ expectations about (counterfactual) patent litigation. Because these expectations are private and non-verifiable,...

Since 1996, the European Commission has been operating a leniency programme, under which companies cooperating with its cartel investigations can obtain immunity from fines or a reduction of fines. Leniency plays a prominent role in EU cartel enforcement today. This paper assesses the positive...

An antitrust authority deters collusion using fines and a leniency program. Unlike in most of the earlier literature, our firms have imperfect cumulative evidence of the collusion. That is, cartel conviction is not automatic if one firm reports: reporting makes conviction only more likely, the...

Following the generally accepted theories of the legal scholar Robert Bork and his Chicago School colleagues, vertical restraints such as exclusive dealing contracts are presumptively procompetitive and welfare-enhancing because it would be irrational for a buyer to exclude the lowest cost...

Causation is one of the most underexplored areas in antitrust law. What must a plaintiff show to connect a defendant’s conduct with anticompetitive effects? Several tests are possible, including “but for” causation, proximate cause, sole causation, reasonable connection, and increased...