Declining outlays for new weapons programs have triggered a process of consolidation that promises to shrink the U.S. defense industry drastically. Consolidation in the defense industry raises complex competition policy issues that are not amenable to conventional antitrust merger analysis. This...

This article follows the evolution of thinking about competition since the passage of the Sherman Act in 1890 as reflected by major antitrust decisions and research in industrial organization. We divide the U.S. antitrust experience into five periods and discuss each period's legal trends and...