System justification makes income gaps appear smaller

People tend to underestimate how much income inequality exists. Much research has attributed this widespread underestimation to differential access to information, variance in exposure to inequality, or motivated attention to different aspects of inequality. In our research, we suggest that the motivation to believe that the current socioeconomic system is fair and legitimate (i.e., system justification) can shape how much inequality people see in the first place, leading them to perceive otherwise identical income gaps as smaller in magnitude. Across eight studies (N = 4113, including a pre-registered sample representative of the U.S. population on key benchmarks), we provide correlational and experimental evidence for a causal association between system justification and perceptions of the magnitude of income gaps. We examine the mediating role of fairness judgments and test this mechanism against other mediators. We also manipulate system justification mindset to test for its causal effect on perceptions of the magnitude of identical income gaps. We contrast the predictive ability of system justification with that of a related motive—social dominance orientation, showing preliminary evidence that system justification is a better predictor of how much inequality people perceive in contexts that do not overlay the economic inequality with intergroup inequality (e.g., racial inequality). Finally, across three of these studies, we assess policy related downstream consequences of the effect of system justification on perceived magnitude of inequality, providing evidence that this effect uniquely contributes to decreased support for redistributive policies.