An in-depth comparative study of the legal and economic concepts which underpin competition enforcement in the United States, Australia, New Zealand and the European Union and the mechanisms for extending or rejecting antitrust jurisdiction across jurisdictional boundaries. The course aims to develop in students an understanding of the different approaches to competition law in the jurisdictions selected so that they may utilise the jurisprudence from these jurisdictions more effectively when acting or advising in competition matters whether in Australia or elsewhere. The course proceeds concept by concept rather than country by country. No prior study of trade practices is required.