The world kws that there is a global crisis of inequality in pay. But what caused it? Where is it more and where less severe? What can be done? This book deploys new techniques and a new global data set to advance striking answers to these questions, answers that have eluded even the largest international research institutions such as the OECD and the World Bank. Chapters trace the U.S. wage structure back to 1920, the relationship of inequality and unemployment in Europe, and the relationships of inequality to ecomic growth, liberalization, financial crisis, state violence and industrial policy in more than fifty developing countries.