Affinity Bias

What is it?

Affinity bias, also called similarity bias or "like me" bias, is the largely unconscious tendency to prefer people who share our qualities, backgrounds, interests, or experiences. One common explanation is evolutionary: trusting people similar to us may once have been adaptive. In modern contexts, however, it can contribute to discrimination, homogeneous teams, and poor decisions. The bias operates on many dimensions: demographics (age, gender, ethnicity), education (same schools, degrees), interests (hobbies, sports), communication style, and personality. In hiring, it shows up as a preference for candidates who "fit the culture" or with whom interviewers feel a natural rapport. First impressions in interviews form quickly, and surface similarities can color them. Affinity bias can reinforce existing power structures and narrow diversity, creating echo chambers where similar people confirm each other's views. It is particularly insidious because we experience it as genuine connection rather than prejudice. Counteracting it requires structured evaluation criteria, diverse interview panels, blind resume reviews, and actively seeking out people who challenge your perspectives rather than confirm them.