This paper examines the determinants of intra-firm trade in U.S. imports using detailed country-productdata. We create a new measure of product contractibility based on the degree of intermediation in internationaltrade for the product. We find important roles for the interaction of country and...

Despite the fact that importing and exporting are extremely rare firm activities, economists generally devote little attention to the role of firms when discussing international trade. This paper summarizes key differences between trading and non-trading firms, demonstrates how these differences...

"This paper 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...