Immigrants may complement native workers, increase productivity, allow specialization by skill in the firm and lower costs. These effects could be beneficial for the firm and increase its productivity and profits. However not all firms use immigrants. Allowing firms to have differential fixed...

The literature pioneered by Krugman (1991a) now known as "New economic geography" has developed very insightful models to understand phenomena as the agglomeration of economic activity and the specialization of regions. Nevertheless I think that the emphasis on the process of specialization, has...

We examine the labor market consequences of an extensive campaign repatriating around 400,000 Mexicans in 1929-34. To identify a causal effect, we instrument county level repatriations with the existence of a railway line to Mexico interacted with the size of the Mexican communities in 1910....