Even after the experience of WWII and despite the existence of various institutions such as United Nations to avoid conflict between nations, we have not succeeded in making a world free from war. The Cold War, the Vietnam War, the intervention of the superpowers in local conflicts and the spread of terrorism have made this all too clear. This volume brings together contributions by leading international scholars of various countries and reconstructs how economists have dealt with issues that have been puzzling them for nearly three centuries: Can a war be 'rational'? Does international commerce complement or substitute war? Who are the real winners and losers of wars? How are military expenses to be funded? The book offers a refreshing approach to the subject and how we think about the relations between economics and war.