Previous iterations of the DOJ/FTC Merger Guidelines have articulated a clear, rigorous, and transparent methodology for balancing the pro-competitive benefits of mergers against their anticompetitive costs. By describing agency practice, guidelines facilitate compliance, ensure consistent and...

Recent outcry for antitrust reform argues that U.S. markets have become more concentrated, that large firms’ profit margins have increased, and that part of these changes may be attributed to lax antitrust enforcement since the 1960s. While each of these arguments is part of an intense...