All is not well in the World Trade Organization. Does a global economy require global institutions? One possible alternative is interregionalism: economic integration between two distinct regions. This book explores the logic of interregionalism by focusing on the European Union, which has pursued agreements with Latin America, East Asia, and the Southern Mediterranean, among others. Why has the EU pursued this strategy? Based on a novel theoretical framework, the authors in this book explore EU interregionalism to provide us with insight into this new emerging face of the international political economy.