There is growing consensus among international trade negotiators and policymakers that a prime area for future multilateral discussion is competition policy. Competition policy includes antitrust policy (including merger regulation and control) but is often extended to include international trade measures and other policies that affect the structure, conduct, and performance of individual industries. This study includes country studies of competition policy in Western Europe, North America, and the Far East (with a focus on Japan) in the light of increasingly globalized activities of business firms. Areas where there are major differences in philosophy, policy, or practice are identified, with emphasis on those differences that could lead to economic costs and international friction. Alternatives for eliminating these costs and frictions are discussed, including unilateral policy changes, bilateral or multilateral harmonization of policies, and creation of new international regimes to supplement or replace national or regional regimes.