Unravelling the relationship between populism and belief in conspiracy theories: The role of cynicism, powerlessness and zero‐sum thinking

In recent years, it has been argued that conspiracy beliefs and populist attitudes go hand in hand. Despite their theoretical and empirical similarities, it remains unclear why these constructs are so closely associated. Across three studies, we examined the processes underlying the relationship between belief in conspiracy theories and populist attitudes. Study 1 (Greece, N = 275) and Study 2 (United Kingdom, N = 300) revealed that the relationship between populist attitudes and conspiracy beliefs is mediated by political cynicism and zero-sum thinking. In Study 3 (USA, N = 300, pre-registered), we use a vignette of a fictitious country to experimentally show that having a newly elected populist party in power (as compared to a well-established party) reduced participants' tendency to believe conspiracy theories. Moreover, this was due to increased empowerment, decreased political cynicism and decreased zero-sum thinking. These findings reveal various complementary mediators of the link between populist attitudes and conspiracy thinking and suggest that electing a populist party in power may reduce conspiracy beliefs among the public.