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原载:The Quarterly Journal of Economics,May 2008我们考虑用异质性企业来阐述一个简单的国际贸易模型,这个模型符合数据的许多专有特征。特别是这个模型预测了两个国家间存在正的或零贸易流量,并且出口企业的数量因目的国的不同而不同。由此,贸易摩擦对贸易流量的影响可分为深度边际和广度边际两部分。前者是指每个出口企业的贸易量,后者是指出口企业的数量。这个模型生成了一般化的引力
We consider the use of heterogeneous firms to describe a simple model of international trade that is consistent with many of the data’s proprietary features. In particular, this model predicts the existence of positive or zero trade flows between two countries, and the number of exporting firms varies by destination country. Thus, the impact of trade frictions on trade flows can be divided into two parts: the depth margin and the breadth margin. The former refers to the trade volume of each exporting enterprise and the latter refers to the number of exporting enterprises. This model generates a generalized gravity