The third edition of this successful textbook is a comprehensive, rigorous survey of the major topics in the field of behavioral economics. Building on the strengths of the second edition, it offers an up-to-date and critical examination of the latest literature, research, developments and debates in the field. Offering an inter-disciplinary approach, the authors incorporate psychology, evolutionary biology and neuroscience into the discussions. And, ultimately, they consider what it means to be `rational', why we so often indulge in `irrational' and self-harming behavior, and also why `irrational' behavior can sometimes serve us well. A perfect book for Economics students taking a module in Behavioural Economics at higher undergraduate level, or for students with an economics background taking a behavioural economics module at Master's level.