Spillovers from immigrant diversity in cities
利用美国雇主-雇员匹配数据，研究发现城市移民多样性通过技能互补提升生产力，对工人产生正向溢出效应，为移民的经济效益提供了新证据。
Theory and evidence suggest that people born in different countries complement each other in the labor market. Immigrant diversity could augment productivity by enabling the combination of different skills, ideas and perspectives, resulting in greater productivity. Using matched employer-employee data for the U.S., this paper evaluates this claim, and makes empirical and conceptual contributions to prior work. It addresses potential bias from unobserved heterogeneity among individuals, work establishments, and cities. The paper also identifies diversity impacts at both city and workplace scales, and considers how relationships vary across different segments of the labor market. Findings suggest that urban immigrant diversity produces positive and nontrivial spillovers for U.S. workers. This social return represents a distinct channel through which immigration may generate broad-based economic benefits.