Comparative Advantage and Heterogeneous Firms
构建了一个包含异质性企业、国家间要素禀赋差异和消费者多样性偏好的国际贸易模型，表明企业应对贸易自由化的行为会在行业层面产生内生李嘉图生产率效应，从而放大国家的比较优势。
This paper presents a model of international trade that features heterogeneous firms, relative endowment differences across countries, and consumer taste for variety. The paper demonstrates that firm reactions to trade liberalization generate endogenous Ricardian productivity responses at the industry level that magnify countries' comparative advantage. Focusing on the wide range of firm-level reactions to falling trade costs, the model also shows that, as trade costs fall, firms in comparative advantage industries are more likely to export, that relative firm size and the relative number of firms increases more in comparative advantage industries and that job turnover is higher in comparative advantage industries than in comparative disadvantage industries.