Oddly Wired
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group

You are a member of a group just by existing.

A 1970 study showed that people favored others simply because they were assigned to the same arbitrary group, even when the groups had no meaning.

In the minimal group paradigm, people assigned to 'Group A' consistently gave more resources to fellow members than to 'Group B.' We are hardwired to distinguish between 'us' and 'them.' We prioritize our tribe even when the definition of that tribe is completely imaginary.

You are biased toward your group before you even know who they are.

Where this comes from

Study
Tajfel (1970), Scientific American
What the check found
The 1970 Scientific American article by Tajfel is the seminal text for the Minimal Group Paradigm. While the provided snippet focuses on line-categorization experiments, the study is correctly identified.
Confidence
Well replicated
groupsocialtribalismidentity

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.