Merely categorising people into arbitrary groups like 'red team' or 'blue team' is sufficient to produce ingroup favouritism.

Question

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Research has shown that even when people are assigned to a group arbitrarily, they tend to develop ingroup favouritism towards those in the same group and show prejudice towards those in the outgroup. This phenomenon is known as minimal group paradigm.

Merely Categorising People into Arbitrary Groups Like 'Red Team' or 'Blue