Global Migration and the World Economy covers two great migration waves: the first, from the 1820s to the beginning of World War I, when immigration was largely unrestricted; the second, beginning in 1950, when mass migration continued to grow despite policy restrictions. The book also explores the period between these two global centuries when world migration shrank sharply because of two world wars, immigration quotas, and the Great Depression. The authors assess the economic performance of these world migrations, the policy reactions to deal with them, and the political economy that connected one with the other. The last third of Global Migration and the World Economy focuses on modern experience and shows how contemporary debates about migration performance and policy can be informed by a comprehensive historical perspective.