The prohibition of certain types of anticompetitive unilateral conduct by firms possessing a substantial degree of market power is a cornerstone of competition law regimes worldwide. Yet notwithstanding the social costs of monopoly modern legal regimes refrain from prohibiting it outright....

This paper discusses possibilities to detect anticompetitive horizontal mergers. In particular, it develops a detection framework for antitrust authorities. The framework considers the potential welfare effects of mergers through changes in product prices and efficiencies, as well as product...

Antitrust authorities search public documents to discover anticompetitive mergers. Thus, investor disclosures may alert them to deals that would otherwise escape scrutiny, creating disincentives for managers to divulge transactions. We study this behavior in publicly traded US companies. First,...

Partisan splits on antitrust enforcement are not new, but some recent divides have gone beyond the usual differences between Republicans and Democrats. Today, we see disagreements among commissioners at the Federal Trade Commission on foundational aspects of competition policy, such as the goals...

Australia is unusual among the world's antitrust jurisdictions in not making the pre-notification of mergers compulsory. However, if the parties are concerned that the Australian Competition and Consumer Commission (ACCC) is likely to object to the merger, there are strong incentives for them to...