Includes bibliographical references and index.

1. Introduction -- A timely argument... -- ...a good argument... -- ...but a difficult argument -- 2. Two paradoxes of globalization -- Economic inequalities -- Political inequalities -- Growing demand for migration -- 3. Some historical perspective -- Migration in the long arc of history -- The mercantilist period -- The liberal period -- The new liberal period -- Conclusion -- 4. The moral argument -- Mobility as a universal right -- The instrumentalist argument -- Conclusion -- 5. A political argument -- The problem with closed borders : the case of apartheid -- A market-based approach -- The political benefits of free migration -- 6. An economic argument -- Host-country benefits -- Sending-country benefits -- International benefits -- Conclusion -- 7. Who opposes free migration? -- Public opinion -- The undying state -- Diffuse and particular interests -- 8. Questioning conventional wisdom -- The great flood of immigrants -- Brain drain -- Migration's effect on culture -- The challenge of political realism -- Security concerns -- 9. Conclusion and policy responses -- Policy responses -- Broadening the debate.