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α: calibrated so average coauthorship-adjusted count equals average raw count
I examine the effects of the ethnic enclave size on labor market outcomes of immigrants. I account for ability sorting into enclaves by exploiting a Danish spatial dispersal policy under which refugees were randomly dispersed across locations. First, I find strong evidence that refugees with unfavorable unobserved characteristics self-select into ethnic enclaves. Second, a relative standard deviation increase in the ethnic enclave size increases annual earnings by 18% on average, irrespective of skill level. Third, further findings are consistent with the explanation that ethnic networks disseminate job information, which increases the job-worker match quality and thereby the hourly wage rate. (c) 2009 by The University of Chicago.