An Empirical Index for Labor Market Density
基于Ellison-Glaeser产业集中度指数，构建了一个衡量劳动力市场密度的结构性指数，该指数反映特定区域潜在可用工人数量，并解释了近一半的地区间工资差异。
We derive a structural index for labor market density based on the Ellison-Glaeser index for industry concentration. The labor market density index serves as a proxy for the number of workers that are potentially available for jobs in a particular area. The index is based on observed home-work location patterns. It is particularly useful for testing theories where the scale of the market matters. We apply this index to a standard wage equation and find that it explains almost half of the cross-region wage variance.