83,017-vacancy RCT: human recruiters add no hires once algorithmic screening exists

danielrock · x · 2026-10-15

A randomized experiment by BU professor Emma Wiles and John Horton assigned human recruiting assistance to 83,017 vacancies on a large online labor market. Recruiters boosted search and screening intensity (+5% applicants), yet treated employers were no more likely to hire than controls with algorithmic tools, with match quality at best unchanged and lower platform retention. A delegated-recruiting model explains it: intermediaries only add value when they bring independent information the algorithm lacks — and that scope shrinks as algorithmic screening improves.

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