This article focuses on an area of study that may be called folk economics and that is currently not on the social science agenda. Folk economics has as its task to analyze and explain how people view the economy and how it works; what categories they use in doing so; and what effect this has on the economy and society. Existing studies in economics and sociology that are relevant to this type of study are presented and discussed. A theoretical framework (...) for analyzing folk economic issues is suggested, centered on the distinction between episteme and doxa or between scientific knowledge, on the one hand, and everyday knowledge, on the other. This is then applied to an exploratory case study of the role that folk economics played in Trump’s presidential campaign. It is shown that Trump and his voters thought in a parallel way on key economic issues, especially protectionism. (shrink)