Ingroup favoritism overrides fairness when resources are limited.

The rmANOVA with a Greenhouse–Geisser correction showed that the main effect of resource amount on the acceptance rate was only marginally significant, F (1.277, 72.791) = 3.601, p = 0.052, η p 2 = 0.059 (Fig. 3 A; Supplementary Table S2 and S3 for further detail).

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