Developing policy evaluation methods based on the microeconomic foundations of agglomeration economies

本研究项目的目的是发展在城市群存在下的次优成本效益分析方法。构建了具有交通投资的城市群空间模型，分析了差别化商品市场产生的间接效益。我们还研究了可以应用于间接效益的估计方法。当差异化商品的种类固定时，可以用加价来估计间接效益。当品种为内生时，结果更为复杂，间接效益可能为负。

The purpose of this research project is to develop the methodologies for second-best cost-benefit analysis in the presence of urban agglomeration. We build a spatial model of urban agglomeration with transportation investment, and analyze the indirect benefits that arise in the differentiated good market. We also examine estimation methods that can be applied to indirect benefits. When the variety of differentiated good is fixed, the indirect benefits can be estimated using price markups. When the variety is endogenous, the results are more complicated, and the indirect benefit can be negative.