We evaluate the impact of European antitrust policy by analyzing the stock market response to investigation announcements, infringement decisions, and appeals. We examine a sample of 253 companies involved in 118 European antitrust cases over the period 1974-2004. We uncover significantly...

Antitrust enforcement efforts in the United States and abroad have been ramped up in high-tech industries, rekindling stale and largely unresolved debates concerning the appropriate role of antitrust enforcement in high-tech markets. Like the previous enforcement actions against Microsoft, and...

There is a growing concern that U.S. merger control may have been too lenient, but empirical evidence remains limited. Event studies have been used as one method to acquire empirical insights into the competitive effects of mergers. However, existing work suffers from strong identifying...