1. The Gain from International Trade -- 2. The Gains from Free Trade / Murray C. Kemp and Henry Y. Wan, Jr. -- 3. An Elementary Proposition Concerning the Formation of Customs Unions / Murray C. Kemp and Henry Y. Wan, Jr. -- 4. The Comparison of Second-Best Equilibria: The Case of Customs Unions / Murray C. Kemp and Henry Y. Wan, Jr. -- 5. The Gains from Trade When Markets are Possibly Incomplete / Murray C. Kemp and Kar-yiu Wong -- 6. The Gains from Free Trade for a Monetary Economy -- 7. The Gains from Trade for a Monetary Economy When Markets are Possibly Incomplete / Murray C. Kemp and Kar-yiu Wong -- 8. Trade Gains in a Pure Consumption-Loan Model -- 9. Gains from Trade with Overlapping Generations / Murray C. Kemp and Kar-yiu Wong -- 10. The Gains from International Trade in a Context of Overlapping Generations / Murray C. Kemp and Nikolaus Wolik -- 11. The Welfare Gains from International Migration.