The tendency toward ingroup bias is so strong that researchers can create artificial groups by randomly assigning people to two categories by tossing a coin.

Question

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Researchers have found that even when people are randomly assigned to groups based on trivial or meaningless criteria, such as a coin toss, they tend to favor their own group over others, demonstrating ingroup bias. This phenomenon has been observed in numerous social psychology experiments, illustrating how easily ingroup biases can form.

The Tendency Toward Ingroup Bias Is So Strong That Researchers