This series of short primers seeks to introduce students to the core concepts, theories and models, both new and established, heterodox and mainstream, contested and accepted, used by economists and political economists to understand and explain the workings of the economy. The books are aimed primarily at undergraduates with little familiarity with economic theory, but who need to orientate themselves in a social science landscape susceptible to fashion, prone to jargon, and thick with competing concepts, theories and methodologies. They will also be welcomed by more experienced readers needing authoritative access to a subject for the first time.