A timely investigation into the conditions that make international agreements—and the institutions that enforce them—vulnerable. When do international institutions effectively promote economic cooperation among countries and help them resolve conflict? Although the international system lacks any central governing authority, states have created rules, particularly around international economic relations, and empowered international tribunals to enforce those rules. Just how effective are these institutions? In Delivering on Promises Lauren J. Peritz demonstrates that these international courts do indeed deliver results—but they are only effective under certain conditions.  As Peritz shows, states are less likely to comply with international rules and international court decisions when domestic industries have the political ability to effectively oppose compliance in particular cases. The author evaluates the argument with an extensive empirical analysis that traces the domestic politics of compliance with the decisions of two international economic courts: the World Trade Organization’s dispute settlement mechanism and the Court of Justice of the European Union. At a time when international agreements are under attack, this book sheds light on the complex relationship between domestic politics and international economic cooperation, offering detailed evidence that international economic courts are effective at promoting interstate cooperation.