David Neumark, economist and University of California, Irvine Distinguished Professor who has investigated the use of correspondence and audit studies to test for discrimination in the labor market said in an email that both types have their uses: “Correspondence studies allow much larger samples. Audit studies are far harder to do, and get smaller samples. But they do allow collection of more information — importantly including whether the final transaction (getting an apartment, a job, etc.) actually happens.”
 
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