Prologue -- Part 1: The Questions and the Process -- 1. The Migration Taboo -- 2. Why Migration Accelerates -- Part 2: Host Societies: Welcome or Resentment? -- 3. The Social Consequences -- 4. The Economic Consequences -- 5. Getting Migration Policy Wrong -- Part 3: Migrants: Grievance or Gratitude? -- 6. Migrants: the Winners from Migration -- 7. Migrants: the Losers from Migration -- Part 4: Those Left Behind -- 8. The Political Consequences -- 9. The Economic Consequences -- 10. Left Behind? -- Part 5: Rethinking Migration Policies -- 11. Nations and Nationalism -- 12. Making Migration Policies Fit for Purpose.