Determinants of Bilateral Trade: Does Gravity Work in a Neoclassical World?, Issue 5377
This paper derives bilateral trade from two cases of the Heckscher-Ohlin Model, both also representing a variety of other models as well. First is frictionless trade, in which the absence of all impediments to trade in homogeneous products causes producers and consumers to be indifferent among trading partners. Resolving this indifference randomly, expected trade flows correspond exactly to the simple frictionless gravity equation if preferences are identical and homothetic, or if demands are uncorrelated with supplies, and they depart from the gravity equation systematically when there are such correlations. In the second case, countries produce distinct goods, as in the H-O Model with complete specialization or a variety of other models, and preferences are either Cobb-Douglas or CES. Here trade tends to the standard gravity equation with trade declining in distance, with departures from it that depend on relative transport costs. Conclusions are, first, that even a simple gravity equation can be derived from standard trade theories, and second, that because the gravity equation characterizes many models, its use to test any of them is suspect
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American Economic Review Anderson Armington Assumption assume barriers to trade bilateral trade flows bilateral trade patterns Bureau of Economic capital-intensive Cobb-Douglas preferences countries trade derive the gravity Determinants of Bilateral distance from suppliers domestic Economic Research elasticity of substitution empirical success expected values exports from country factor endowments factor proportions fraction frictionless gravity equation full subscription functional form groups of countries H-0 model Heckscher-Ohlin Helpman impeded trade Imperfect Competition importer indifferent among trading industry International Trade j's relative distance Jeffrey H Krugman Levinsohn Massachusetts Avenue MasterCard monopolistic competition model National Bureau NBER Working Papers NEOCLASSICAL WORLD pair of countries perfectly competitive positive transport costs producers and consumers product differentiation randomly result Ricardian model simple frictionless gravity simple gravity equation standard gravity equation Stanley Fischer Theoretical Foundation trade barriers trade impediments transactions transport factor value of exports volume of trade world averages world income Yacine Alt-Sahalia zero