A résumé audit study of 36,880 applications reveals where hiring discrimination concentrates: not randomly across all jobs, but specifically in roles where evaluation is subjective. The researchers define evaluative discretion as the share of hiring decisions driven by subjective rather than verifiable assessment. Jobs high in analytical and interpersonal skill requirements but low in routine tasks — management, consulting, creative roles — show the widest callback gaps between demographic groups.
The mechanism is straightforward. When hiring criteria are objective and measurable — test scores, certifications, years of specific experience — there's less room for bias to operate. The candidate either meets the threshold or doesn't. When criteria are subjective — "leadership potential," "cultural fit," "communication skills" — evaluators must make judgment calls, and those calls carry the evaluator's biases.
This isn't about intent. The same hiring managers may be equitable when evaluating objective qualifications and discriminatory when exercising discretion. The discretion itself is the channel through which bias flows.
The practical implication inverts the usual framing. The question isn't "how do we eliminate bias from evaluators" — it's "how do we design evaluation processes with less discretionary space." Structured interviews, standardized assessments, blind evaluations, and concrete performance metrics don't require people to become less biased. They require evaluations to become more constrained. The gap closes not because attitudes change but because the process leaves less room for attitudes to matter.