As of 2004 California employed almost 30% of all foreign born workers in the U.S. and was the state with the largest percentage of immigrants in the labor force. It also received a very large number of Mexican and uneducated immigrants during the recent decades. If immigration harms the labor...

A series of recent influential papers has emphasized that in order to identify the wage effects of immigration one needs to consider national effects by skill level. The criticism to the so called „area approach“ is based on the fact that native workers are mobile and would eliminate, in the...