How will the rapid growth of trade, cross-border mergers and acquisitions, and international joint ventures alter antitrust enforcement? Can national antitrust enforcement guard against anticompetitive corporate practices in a globalizing world? Or will international friction increase as nations disagree over antitrust cases, like the Boeing-McDonnell Douglas merger? Recognizing the sheer volume of transatlantic commerce, the EU and U.S. have long cooperated on antitrust matters, but what has that cooperation achieved? And how far should such cooperation go in the future? This volume addresses these questions in the context of antitrust policies towards cartels, mergers and acquisitions, and vertical restraints. Leading experts elucidate the changing nature of antitrust enforcement on both sides of the Atlantic, with a keen eye to future multilateral, as well as bilateral, developments.