Chapter 4 The Gravity Model in International Trade
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Since Jan Tinberben’s original formulation (Tinbergen 1962, Shaping the World Economy, The Twentieth Century Fund, New York), the empirical analysis of bilateral trade flows through the estimation of a gravity equation has gone a long way. It has acquired a solid reputation of good fitting; it gained respected micro foundations that allowed it to move to a mature stage in which the “turn-over” gravity equation has been replaced by a gravity model; and it has dominated the literature on trade policy evaluation. In this chapter we show how some of the issues raised by Tinbergen have been the step stones of a 50-year long research agenda, and how the numerous empirical and theoretical contributions that followed dealt with old problems and highlighted new ones. Some future promising research issues are finally indicated.