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Validation of the General and Personal Belief in a Just World scales in Iran and Their Relations to Perceived Threat of Kin Favoritism

People possess a pre-conscious need to believe in the existence of justice in the world. This belief in a just world (BJW) is usually measured with self-report scales. Dalbert et al. (1987) and Dalbert (1999) have developed the general belief in a just world (GBJW) and personal belief in a just world (PBJW) scales as psychometrically robust measures of just-world beliefs. We conducted three studies to demonstrate the validity of the Persian versions of belief in a just world scales and the importance of distinguishing between GBJW and PBJW. First, we confirmed the factor structure. reliability, convergent validity (self-esteem, life satisfaction, and religiosity), and divergent validity (big five personalityfactors and dark triad traits) of GBJW and PBJW using Iranian participants (N1 = 454). Second, the associations of GBJW and PBJW with perceived threat of unjust behavior directed to self or others were assessed using two scenario-based studies (N2 = 81, N3 = 71) in the context of kin favoritism. While GBJW negatively predicted perceived threat of kin favoritism directed to others, PBJW was a negative predictor of perceived threat of kin favoritism directed to self. Consistent with theoretical assumptions, perceived likelihood of punishment mediated these associations. In addition to providing further evidence for the differentiation between GBJW and PBJW, the findings of Study 2 and 3 also support the idea of an optimistic bias towards self by showing that people perceived less threat of kin favoritism when others, rather than themselves, were potential victims of injustice.