A Fast and Frugal Finance: Bridging Contemporary Behavioural Finance and Ecological Rationality adds psychological reality to classical financial reasoning. It shows how financial professionals can reach better and quicker decisions using the ‘fast and frugal’ framework for decision-making, adding dramatically to time and outcome efficiency, while also retaining accuracy. The book provides the reader with an adaptive toolbox of heuristic tools and classification systems to aid real-world decisions. Throughout, financial applications are presented alongside real-world examples to help readers solve established problems in finance, including stock buying and selling decisions, when faced with not only risk but fundamental uncertainty. The book concludes by describing potential solutions to financial problems in the forefront of contemporary debates, and calls for taking psychological insights seriously.