Behavioural economics and its sister field, behavioural finance, is the study of social, cognitive and emotional factors on the economic decisions of individuals and institutions. This field is typically focused on the bounds of rationality by economic agents. Behavioural models typically integrate insights from psychology with neo-classical economic theory, and therefore cover a range of concepts, methods and paradigms. There are three prevalent themes in behavioural finance: Heuristics, Framing and Market Inefficiencies.