Affinity Bias

What is it?

Affinity bias, also called similarity bias or "like me" bias, is the unconscious tendency to prefer people who share similar qualities, backgrounds, interests, or experiences with ourselves. Evolutionary psychology suggests this developed as a survival mechanism—trusting those similar to us was often adaptive. However, in modern contexts, it leads to discrimination, homogeneous teams, and poor decision-making. The bias operates on multiple dimensions: demographics (age, gender, ethnicity), education (same schools, degrees), interests (hobbies, sports), communication style, and personality. In hiring, it manifests as preferring candidates who "fit the culture" or with whom interviewers feel a natural rapport. Research shows interviewers often decide within seconds based on superficial similarities. Affinity bias reinforces existing power structures and reduces diversity. It creates echo chambers where similar people confirm each other's views. The bias 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.