Acknowledgements -- Introduction -- 1. The Economics of Customs Unions -- 2. The General Theory of Second Best -- 3. Customs Union from a Single-Country Viewpoint -- 4. Tariffs and Trade in General Equilibrium: Comment -- 5. Trade and Welfare in General Equilibrium -- 6. On Optimum Tariff Structures -- 7. Optimum Tariffs and Retaliation -- 8. The Optimal Tariff Structure in Higher Dimensions -- 9. A Note on the Optimal Tariff, Retaliation and the Welfare Loss from Tariff Wars in a Framework with Intra-Industry Trade -- 10. A Theory of Piecemeal Policy Recommendations -- 11. Inter-Commodity Substitution with Constant Real Prices: 2 The Graham Demand Case -- 12. A 3x3 Model of Customs Unions -- 13. Is Unilateral Tariff Reduction Preferable to a Customs Union? The Curious Case of the Missing Foreign Tariffs -- 14. Integration in Goods and Factors: The Role of Flows and Revenue -- 15. Welfare Effects in Customs Unions -- 16. Delegation Games in Customs Unions -- 17. The Welfare Effect of Tariff Rate Reductions in a Many Country World -- 18. Paradoxes in Integration Theory -- 19. An Elementary Proposition Concerning the Formation of Customs Unions -- 20. The Move Toward Free Trade Zones -- 21. Multilateral Trade Negotiations and Preferential Trading Arrangements -- 22. The Size of Trading Blocs: Market Power and World Welfare Effects -- 23. Optimal Tariff Equilibria With Customs Unions -- 24. Tariff Revenue Competition in a Free Trade Area -- 25. An Extension of the Kemp-Wan Theorem on the Formation of Customs Unions -- 26. Bringing GATT into the Core -- 27. Measurable Dynamic Gains from Trade -- 28. Do Static Gains from Trade Lead to Medium-Run Growth? -- 29. Comparative Advantage and Long-Run Growth -- 30. Economic Integration and Endogenous Growth -- Name Index.