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A meta-analysis examined the relation between self-esteem and ingroup bias. The project focused on effects of ingroup bias strategy and measurement of self-esteem. Results indicated that high-self-esteem individuals exhibited more ingroup bias than did low-self-esteem individuals. Bias strategy and self-esteem measurement moderated this relation. When using “direct” ingroup bias strategies, high-self-esteem individuals showed more bias than did low-self-esteem individuals. When using “indirect” strategies, groups exhibited comparable amounts of bias. Results were comparable for collective and personal self-esteem measures. Examination of specific collective measures indicated that self-esteem defined by the Collective Self-Esteem Scale (Luhtanen however, expression of ingroup bias by individuals with low self-esteem is constrained by situational factors. Furthermore, individual-level factors such as personal self-esteem may be useful in predicting collective enhancement.
Aberson et al. (2000) studied this question.