The primary manufacturers of vitamins admitted to participating in international market-share-agreement cartels for several years during the 1990s. Their announced price increases appeared in leading trade journals. We show that price announcements during the cartel period, and the lead times...

Mergers have the potential for negative social welfare consequences from increased likelihood or effectiveness of future collusion. This raises the question of whether there are meaningful thresholds for the post-merger industry that should trigger significant scrutiny by the Department of...