Endogenous local labour markets, regional aggregation and agglomeration economies
利用荷兰行政数据，基于通勤结果、性别和教育程度定义地方劳动力市场，发现高学历和男性员工的市场范围更大；随着区域加总水平提高，城市工资溢价估计值上升，且该模式不能用可塑面积单元问题解释，表明更高加总水平上集聚外部性更强。
We examine the role of spatial unit size in measuring the urban wage premium. Using Dutch administrative data, we define local labour markets (LLMs) based on employees’ commuting outcomes, gender and educational attainment. We show that high-educated employees and male employees have a relatively large LLM. Using a continuum of regional aggregations, we find that urban wage premium estimates increase over the level of aggregation, also for different subgroups of employees. We show that the modifiable areal unit problem (MAUP) does not explain this pattern, consistent with stronger agglomeration externalities at higher regional aggregation levels.