Acknowledgements; Part One: Micro foundations of International Trade 1. The Micro-Economic Foundation of the Pure Theory of International Trade 2. A Two Sector-Model of a Closed Economy Part Two: Theories of Comparative Advantage 3. A Model of Exchange and the Marshall-Lerner Stability Conditions 4. The Ricardian Theory of Comparative Advantage 5. The Hecksher Ohlin Theory of Comparative Advantage and Factor-Price Equalization Theorem Part Three: The Theory of Factor Price Differentials 6. Factor Price Differentials, the Shape of the Transformation Locus, and the Relationship between Prices and Output Levels 7. Theorems on Gains from Trade and Factor-Price Differentials 8. Factor Price Differentials, Economic Expansion, Terms of Trade and Welfare at Constant and Variable Prices Part Four: Unemployment in Models of International Trade 9. Uniform Real Minimum Wage Rate, Unemployment and Theory of Trade 10. Sector-Specific Minimum Wages, Urban Unemployment and Optimal Commercial Policy in a Small Open Economy Part Five: Non-Traded and Intermediate Goods and the Theory of Trade 11. A Simple Geometrical Treatment of Non-Traded Goods in the Pure Theory of International Trade 12. Intermediate Goods: An Introduction to Traded Intermediate Goods in the Theory of Trade via Simple Geometry Part Six: Tariffs, Quotas, and Tariff-Related Activities 13. Nominal Tariffs and Trade Equilibrium 14. Tariffs, Variable Terms of Trade, and Immiserizing Growth in the Case of Monopoly Power in Trade Part Seven: Trade Models with Specific Factors and Colonialism 15. On Factor Specificity and Trade Theory 16. Sector Specificity of Foreign-Owned Capital and Colonialism Part Eight: Dynamic Models of Closed and Open Economies 17. A Two-Sector Growth Model of a Closed Economy with Fixed Coefficients 18. A Two-Sector Growth Model of an Open Economy; Appendix 1; Appendix 2;