I. General equilibrium. International factor-price equalisation once again / Paul A. Samuelson -- International trade and factor mobility / Robert A. Mundell -- Are international trade and factor mobility substitutes? / Kar-yiu Wong -- The two-sector model in terms of its dual : a geometric exposition / Michael Mussa -- Short-run capital specificity and the pure theory of international trade / J. Peter Neary -- II. Trade-pattern theories. Factor proportions and comparative advantage in the long run / Ronald Findlay -- Weak links in the chain of comparative advantage / Alan V. Deardorff -- The Leontief Paradox, reconsidered / Edward E. Leamer -- III. Imperfect competition and market structure. Increasing returns, monopolistic competition, and international trade / Paul R. Krugman -- Tariffs and the extraction of foreign monopoly rents under potential entry / James A. Brander and Barbara J. Spencer -- Optimal trade and industrial policy under oligopoly / Jonathan Eaton and Gene M. Grossman -- International trade policy for oligopolistic industries / Avinash Dixit -- IV. Quotas and voluntary export restraints (VERs). The non-equivalence of tariffs and quotas under retaliation / Carlos Alfredo Rodriguez -- Voluntary export restraint in U.S. autos, 1980-81 : quality, employment, and welfare effects / Robert C. Feenstra -- V. Theory of distortions. Optimal trade intervention in the presence of domestic distortions / Harry G. Johnson -- The generalized theory of distortions and welfare / Jagdish N. Bhagwati -- VI. Directly unproductive profit-seeking (DUP) activities. The political economy of the rent-seeking society / Anne O. Krueger -- DUP activities and economic theory / Jagdish N. Bhagwati, Richard A. Brecher, and T.N. Srinivasan -- Endogenous tariff formation / Wolfgang Mayer -- VII. Customs unions. The theory of customs unions : a general survey / Richard Lipsey -- An elementary proposition concerning the formation of customs unions / Murray Kemp and Henry Wan, Jr. -- VIII. Growth and transfers. The possibility of income losses from increased efficiency or factor accumulation in the presence of tariffs / Harry G. Johnson -- Tariffs, foreign capital, and immiserizing growth / Richard A. Brecher and Carlos F. Diaz-Alejandro -- Capital accumulation in the open two-sector economy / M. Alasdair M. Smith -- Investment, the two-sector model, and trade in debt and capital goods / Stanley Fischer and Jacob A. Frenkel -- The transfer problem and exchange stability / Harry G. Johnson -- The generalized theory of transfers and welfare : bilateral transfers in a multilateral world / Jagdish N. Bhagwati, Richard A. Brecher, and Tatsuo Hatta -- IX. Foreign investment. Multinationals, multi-plant economies, and the gains from trade / James R. Markusen -- A simple theory of international trade with multinational corporations / Elhanan Helpman.