Trade in variety and domestic production: Evidence from US manufacturing
研究了美国制造业中产品种类变化对福利的影响，发现考虑资源向多品种大企业重新配置后，国内品种增长带来的福利收益显著，补充了进口品种的收益。
Abstract Welfare gains from increasing product variety are an important source of the gains from international trade. Previous empirical studies, however, typically focus on measuring gains from imported varieties. This paper introduces a measure to analyze changes in domestically produced varieties to estimate the total variety gains. Our analysis suggests that, for US manufacturing, losses in domestic varieties from 1992 to 2006 seem substantial given the large decline in the number of US establishments. Yet, once we account for the reallocation of resources towards large multi‐variety firms, we find considerable domestic variety gains, adding to those from imported varieties.