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The Geometry of the Distance Coefficient in Gravity Equations in International Trade

机译：国际贸易中重力方程中距离系数的几何

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摘要

Gravity equations in trade imply that trade flows are proportional to the size of a country and inversely proportional to distance. This paper develops the analogy of gravity in physics with gravity in trade and provides geometric intuition for a large class of mathematical processes in two-dimensional space for which these relationships would be expected. This model implies that distances between countries in empirical gravity estimations should be measured as weighted harmonic means of pairwise distances of local economic activity.
机译：贸易中的重力方程式暗示贸易流量与一个国家的大小成正比，与距离成反比。本文开发了物理学中的引力与贸易引力的类比，并为二维空间中的一类数学过程提供了几何直觉，可以期望这些关系。该模型暗示经验重力估计中的国家之间的距离应作为本地经济活动的成对距离的加权和均值来度量。

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