Part I.A Standard Analysis of Factor Mobility: 1. Beneficial versus distortionary mobility of factors of production; 2. Factor mobility and goods trade: do they substitute each other?; Part II. Migration to the Welfare State: 3. Intertemporal social insurance and migration; 4. Intratemporal social insurance: attractiveness to migrants and attitude of native-born; 5. Intratemporal social insurance: the interaction between migration and the size of the welfare state; 6. The effects of migration on the welfare state: empirical evidence; Part III. Distorted Capital Flows: 7. Bank runs and capital flow reversals; 8. Country risk and capital flow reversals; 9. Foreign portfolio equity investment and the saving-investment correlation; 10. Foreign direct investment: a challenge for control of domestic capital; 11. Foreign direct investment: a vehicle for technology transfer and increased competition.