In an experiment using the minimal group paradigm based upon picture preferences, Billig and Tajfel (1973) found that children who were asked to reward other children:

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Billig and Tajfel (1973) found that children favored children who were categorized as similar to themselves in terms of shared preferences or beliefs, demonstrating in-group favoritism even in minimally defined groups.

In an Experiment Using the Minimal Group Paradigm Based Upon