More than a hundred countries have enacted competition laws and modeled their laws either on the U.S. or on the EU system. This course will focus on the U.S. and the EU antitrust regimes by comparing and contrasting their principles and procedures. Some new jurisdictions at the center of the international antitrust arena, such as China and Brazil, will also be discussed. This course will start with an overview of the institutional design and of the substantive standards applied by the FTC/DOJ in the U.S. and by the European Commission in the EU, and will then delve into various areas of antitrust law, with particular emphasis on cartels, horizontal and vertical restraints, abuse of dominance, and mergers. This course will also examine process and procedures in the U.S. and the EU, and consider practices that facilitate international cooperation in antitrust investigations.