Abstract Are political attitudes a stable feature of individuals or a rational response to changing circumstances and contexts? This question has long been a feature of political science and underpins our theories of how political attitudes are formed and what their consequences might be. In this paper, we explore this perennial question with a focus on the case of political trust, a fundamental indicator of democratic legitimacy and a long‐standing topic of debate. Theoretically, we devise a framework that highlights how different theories of political trust assume different levels of stability or volatility and the implications that this has for those theories and their normative consequences. Empirically, we study within‐individual stability of political trust using six panel studies that cover five countries between 1965 and 2020. Our results consistently point to trust being stable in the long term, with potential for short‐term volatility in response to changing political contexts, and for substantial changes between people's formative years and their adulthood. Even over a period of 19 years, most people's responses to trust questions are remarkably similar between surveys and significant life events such as unemployment and going to University do not significantly influence trust. Changes in the political environment, like incumbent government turnover, have larger effects but these appear to return to equilibrium in a few years. The exception to this general finding is individuals who are first surveyed when they are under the age of 18, who appear much more likely to change their trust levels in subsequent waves. Overall, our results complement previous research on attitude stability, indicating that trust is approximately as stable as other attitudes, such as towards immigration and redistribution. These findings have fundamental implications for our understanding of the nature of political trust and attitude formation more broadly.
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