The 2023 Merger Guidelines and The Role of Economics

Abstract Relying heavily on legal analysis, the 2023 Merger Guidelines argue for a fundamental shift in antitrust enforcement that places more emphasis on protecting competitors and less on protecting the beneficiaries of competition. It is up to courts, not economists, to ascertain whether this interpretation of antitrust law is correct. But economists can and should analyze the likely economic effects. Evidence that antitrust enforcement has permitted some markets to be overly concentrated justifies the tightening of horizontal merger enforcement that is signaled by these guidelines. Evaluating the elimination of double marginalization from vertical mergers as a part of an efficiency defense rather than as a primary economic effect reflects a fundamental misunderstanding of the economics of vertical mergers. At a minimum, these guidelines will further damage the reputation of the DOJ and FTC among competition policy enforcers in other countries. A potentially more serious cost will be if foreign competition authorities use these guidelines to justify enforcing their own laws to protect inefficient domestic firms against foreign competition.