Public Infrastructure Investment, Interstate Spatial Spillovers, and Manufacturing Costs
利用1982-1996年美国州级制造业数据，通过成本函数模型分析州内和州际公共基础设施投资对私人企业成本的节省效应，发现考虑空间溢出效应后，州内基础设施的成本节省效果更显著。
Effects of public infrastructure investment on the costs and productivity of private enterprises have proven difficult to quantify empirically. One piece of this puzzle that has received little attention is spatial spillovers. We apply a cost-function model to 1982-1996 state-level U.S. manufacturing data, to untangle the private cost-saving effects of inter- and intrastate public infrastructure investment. We implement two spatial adaptations-including a spatial spillover index in the theoretical model, and allowing for spatial autocorrelation in the stochastic structure. Recognizing such spillovers both increases the estimated magnitude and significance of cost savings from intrastate public infrastructure, and augments these productive effects. © 2004 President and Fellows of Harvard College and the Massachusetts Institute of Technology.