Casual observation suggests that in most U.S. urban labor markets, immigrants have more immigrant coworkers than native-born workers do. While seeming obvious, this excess tendency to work together has not been precisely measured, nor have its sources been quantified. Using matched employer–employee data from the U.S.
The Workplace Concentration of ImmigrantsFredrik Andersson, Monica Garcia-Perez, John C. Haltiwanger, Kristin McCue, and Seth Sanders ,
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