EVOLVING AGGLOMERATION IN THE U.S. AUTO SUPPLIER INDUSTRY*
使用非参数描述工具和条件逻辑模型，研究了美国汽车供应商工厂的集聚模式，发现新老工厂高度集中在东部，且集聚程度受底特律距离、装配厂邻近性和高速公路系统影响。
ABSTRACT Using nonparametric descriptive tools developed by Duranton and Overman (2005, Review of Economic Studies , 72, 1077–1106), we show that both new and old auto supplier plants are highly concentrated in the eastern United States. Conditional logit models imply that much of this concentration can be explained parametrically by distance from Detroit, proximity to assembly plants, and access to the interstate highway system. New plants are more likely to be located in zip codes that are close to existing supplier plants. However, the degree of clustering observed is still greater than implied by the logit estimates.