Multiple-Product Firms and Product Switching
研究了美国制造业企业频繁调整产品组合的现象，发现半数企业每五年改变产品结构，且产品转换与企业及产品特征相关，有助于资源在企业内部向高效用途再配置。
This paper examines the frequency, pervasiveness, and determinants of product switching by US manufacturing firms. We find that one-half of firms alter their mix of five-digit SIC products every five years, that product switching is correlated with both firm- and firm-product attributes, and that product adding and dropping induce large changes in firm scope. The behavior we observe is consistent with a natural generalization of existing theories of industry dynamics that incorporates endogenous product selection within firms. Our findings suggest that product switching contributes to a reallocation of resources within firms toward their most efficient use.