The concept of state sovereignty is increasingly challenged by a proliferation of international economic instruments and major international economic institutions. Numerous States are re-examining and debating the extent to which they should cede control over their economic and social policies to achieve global economic efficiency in an interdependent world. International lawyers are seriously rethinking the subject of state sovereignty, in relation to the operation of the main international economic institutions, namely the WTO, the World Bank, and the International Monetary Fund (IMF). The contributions in this volume take up the challenge of debating the meaning of sovereignty and the impact of international economic law on state sovereignty. The first part of the book looks at the issues from the perspectives of general international law, international economic law, and legal theory. Part two discusses the impact of trade liberalization on the sovereignty of both industrialized and developing states. Part three concentrates on the challenge to state sovereignty created by the proliferation of investment treaties and the significant recent growth of investment treaty based arbitration cases.