The European Union is a key actor in international economic governance. Through its foreign economic policies it plays a central role in the negotiation of international trade agreements, the global regulation of the financial services sector, and the provision of aid to developing countries. This book shows how principal-agent theory can be used to shed new light on this complex of policy areas. In particular, the contributions to this volume analyze delegation, control, and agent strategies in a variety of principal-agent relationships shaping the EU's foreign economic policies: mainly those involving interest groups and governments; governments and the European Commission; and the European Union and international organizations. The chapters, written by leading experts in the field, offer empirically-rich studies of various areas of the EU's external economic relations including trade, financial regulation, accounting standards and global regulation through the G7/G8. The book is aimed at researchers and advanced students interested in the EU, international economic relations, and principal-agent theory. This book was published as a special issue of the Journal of European Public Policy.