Multiproduct Firms and Trade Liberalization
构建了一个多产品、多目的地企业的一般均衡模型，解释企业内产品范围选择如何影响贸易模式，并用贸易政策变化和截面数据验证了模型预测。
This article develops a general equilibrium model of multiple-product, multiple-destination firms, which allows for heterogeneity in ability across firms and in product attributes within firms. Firms make endogenous entry and exit decisions and each surviving firm chooses optimally the range of products to supply to each market. We show that the resulting selection, across and within firms, provides a natural explanation for a number of features of trade across firms, products, and countries. Using both time-series changes in trade policy and cross-section variation in trade, we provide empirical evidence in support of the predictions of the model. Copyright 2011, Oxford University Press.