This is the third revised edition of this text which was first published in 1989, and based on a General Course held by the author at The Hague Academy of International Law in 1986. It is designed to serve as a standard textbook on international economic law, suitable for reference and studies. This edition takes account of some of the new developments in international economic law, such as the ramifications of the Internet. The comprehensive analysis of all rules of public international law having direct influence on economic relations has been maintained and elaborated. Special attention is paid to the claims for a new international economic order, the extraterritorial reach of domestic legislation, the effects of nationalization, the protection of the environment, state immunity and economic welfare.