Shelley’s engagement with economics is central to his work. From Queen Mab (1813) to ‘A Philosophical View of Reform’ (composed 1819–20), his discussion of economic events and ideas helped him to critique the social world and propose how it could be improved. His work responds to the productive activities of the labouring poor in the factories and the fields, and to the financial phenomena reshaping Britain’s economy, from public debt to fiat currency. Crucial to Shelley’s economics was the perception that orthodox ideas, such as the labour theory of value and the quantity theory of money, could be used to promote radical ends. The chapter outlines the role of such ideas in Shelley’s work and his response to key economic writers, including Thomas Robert Malthus and William Cobbett. It also outlines how, for Shelley, the production of credible economic knowledge was vital to attaining economic change to benefit the many.