In-group Bias

What is it?

In-group bias (or in-group favoritism) is the tendency to favor members of one's own group over outsiders. Henri Tajfel's "minimal group" experiments showed that even arbitrary groupings (like preferring one abstract painter over another) triggered preferential treatment of in-group members. The bias operates unconsciously and automatically. We allocate more resources, extend more trust, give more charitable interpretations, and provide more positive evaluations to those we perceive as "us." Evolutionarily, this made sense: cooperating with your tribe increased survival. But in modern contexts, it creates problems. In hiring, we favor candidates who share our background. In performance reviews, we rate in-group members higher. In conflicts, we assume bad intent from out-groups while granting benefit of the doubt to in-groups. The bias perpetuates homogeneity and inequality. It's often invisible to those displaying it—we don't see ourselves as biased; we just "click better" with certain people. Counteracting in-group bias requires awareness of group boundaries, structured decision-making processes that reduce discretion, diverse decision-making bodies, and explicit evaluation criteria applied consistently.