Example image of eyePlorer eyePlorer map for 'Internationalization': Gains from trade Gravity model Gross domestic product International economics Social sciences Alliances International relations North American Free Trade Agreement Trade Treaty World Trade Organization Bertil Ohlin Eli Heckscher General equilibrium theory Stockholm School of Economics Comparative advantage David Ricardo Factors of production Factor price equalization Capital (economics) Capital intensity Economics Export Econometrics Heckscher-Ohlin theorem Wassily Leontief Factor endowment Labour economics United States Conjecture International trade Demand (economics) Preference Product differentiation Specialization Economic geography Regional science Microeconomics Economic efficiency Free market Goods and services Outline of industrial organization Henry Sidgwick Charles P. Kindleberger Multinational corporation Stephen Hymer Critique Economy Free trade Network effect