Preferential trading arrangements (PTAs) play an increasingly prominent role in the global political economy, two notable examples being the European Union and the North American Free Trade Agreement. These agreements foster economic integration among member states by enhancing their access to one another's markets. Yet despite the importance of PTAs to international trade and world politics, until now little attention has been focused on why governments choose to join them and how governments design them. This book offers valuable new insights into the political economy of PTA formation....