Urban Public Works in Spatial Equilibrium: Experimental Evidence from Ethiopia
评估了埃塞俄比亚亚的斯亚贝巴随机推广的大型城市公共工程计划，发现该计划增加了公共就业、减少了受益者的私人劳动供给，并改善了当地设施；结合空间均衡模型和通勤数据，估计了计划对私人部门工资的溢出效应，全面实施后工资上涨18.6%，且考虑间接效应后贫困人口福利增益扩大六倍。
This paper evaluates a large urban public works program randomly rolled out across neighborhoods of Addis Ababa, Ethiopia. We find the program increased public employment and reduced private labor supply among beneficiaries and improved local amenities in treated locations. We then combine a spatial equilibrium model and unique commuting data to estimate the spillover effects of the program on private sector wages across neighborhoods: under full program rollout, wages increased by 18.6 percent. Using our model, we show that welfare gains to the poor are six times larger when we include the indirect effects on private wages and local amenities.