The Effect of Internal Migration on Local Labor Markets: American Cities during the Great Depression
利用大萧条时期美国城市数据，发现移民流入对本地居民时薪影响很小，但导致部分居民迁出、失去工作或转为兼职，每10个移民约使1.9人迁出、2.1人失去救济工作、1.9人转为兼职。
The Great Depression offers a unique laboratory to investigate the causal impact of migration on local labor markets. We use variation in the generosity of New Deal programs and extreme weather events to instrument for migrant flows to and from U.S. cities. In-migration had little effect on the hourly earnings of existing residents. Instead, in-migration prompted some residents to move away and others to lose weeks of work or access to relief jobs. For every 10 arrivals, we estimate that 1.9 residents moved out, 2.1 were prevented from finding a relief job, and 1.9 shifted from full-time to part-time work. (c) 2010 by The University of Chicago. All rights reserved.