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Categorization erases nuance, making groups seem more uniform inside and more different from one another.
Participants preferred $10 for their group and $5 for another over $11 for both groups.
In a 2021 brain-scan study of 34 people, rival political out-groups blocked learning from successes and failures.
The desire for a positive social identity can produce discrimination even when it harms your own material interests.
In Sherif’s camp experiment, competition produced discrimination, conflict, and fighting that outlasted the competition itself.
Disco Demolition Night shows how musical-group identity can turn dislike of another genre into collective hostility.
Recruiters can radicalize people by offering a highly distinctive, appealing identity inside an extremist group.
People can favor their own group and disadvantage another after nothing more than being assigned to groups.
A lower-status group can claim superiority by comparing itself with outsiders on a different attribute, such as intelligence.
Your preference for domestic over foreign-made products can reveal in-group and out-group thinking, including ethnocentrism or nationalism.
Realistic group conflict theory traces intergroup hostility to competition over scarce resources, including dwindling water.
Realistic group conflict theory needs scarce resources to explain prejudice. Social identity theory says scarcity is unnecessary.
Categorization exaggerates differences between groups, encouraging broad negative judgments of outsiders.
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