Theories of Heterogeneous Firms and Trade
综述了异质性企业贸易理论，强调企业进入国际市场的选择和资源在企业间的重新配置，并讨论了该理论对比较优势、市场规模、贸易福利和收入分配的影响。
This article reviews the recent theoretical literature on heterogeneous firms and trade, which emphasizes firm selection into international markets and reallocations of resources across firms. We discuss the empirical challenges that motivated this research and its relationship to traditional trade theories. We examine the implications of firm heterogeneity for comparative advantage, market size, aggregate trade, the welfare gains from trade, and the relationship between trade and income distribution. Although a number of studies examine the endogenous response of firm productivity to trade liberalization, modeling internal firm organization and the origins of firm heterogeneity remain interesting areas of ongoing research.