The psychology of zero-sum beliefs

People often hold zero-sum beliefs (subjective beliefs that, independent of the actual distribution of resources, one party’s gains are inevitably accrued at other parties’ expense) about interpersonal, intergroup and international relations. In this Review, we synthesize social, cognitive, evolutionary and organizational psychology research on zero-sum beliefs. In doing so, we examine when, why and how such beliefs emerge and what their consequences are for individuals, groups and society. Although zero-sum beliefs have been mostly conceptualized as an individual difference and a generalized mindset, their emergence and expression are sensitive to cognitive, motivational and contextual forces. Specifically, we identify three broad psychological channels that elicit zero-sum beliefs: intrapersonal and situational forces that elicit threat, generate real or imagined resource scarcity, and inhibit deliberation. This systematic study of zero-sum beliefs advances our understanding of how these beliefs arise, how they influence people’s behaviour and, we hope, how they can be mitigated. People hold subjective beliefs that, independent of the actual distribution of resources, one party’s gains are inevitably accrued at other parties’ expense. In this Review, Davidai and Tepper synthesize research on when and why such zero-sum beliefs emerge and their consequences for individuals, groups and society.