Behavioral economics

Behavioral economics brings findings from psychology and other behavioural sciences into the study of economic decisions. Much conventional economic modelling analyzes choices through assumptions about preferences, information and decision-making; behavioural research tests how well particular assumptions describe observed behaviour and develops explanations where evidence points to systematic departures. It is not a single alternative model: it includes many theories and findings about preferences, beliefs, attention and choice. Nor does it imply that people always make poor decisions. The aim is to explain decisions in their actual settings and to understand when behavioural patterns influence economic outcomes.

Researchers study several recurring patterns. Bounded rationality describes decisions made with limited time, information or mental resources. Heuristics are practical shortcuts that can help people decide quickly, but in some circumstances they can also produce predictable errors. Prospect theory, developed by Daniel Kahneman and Amos Tversky, describes choices under risk in relation to gains and losses rather than only final outcomes; loss aversion refers to the commonly observed tendency for losses to weigh more heavily than comparable gains. Other topics include framing, limited attention, present-focused choices, self-control, mental accounting and preferences about fairness or cooperation. These are research concepts, not universal rules that predict every individual's behaviour.

Behavioural economists use several kinds of evidence, including laboratory and field experiments, surveys and observations of choices in markets and institutions. Methods differ in what they can establish: controlled studies can isolate aspects of a decision, while field evidence examines behaviour in real-world settings. Reviews compare results across topics such as consumption, finance, work, charitable giving, voting and public policy, and consider how learning and market interaction may change the effects observed. The field developed through exchanges between economics and psychology; research on judgment under uncertainty and on experimental economic methods helped make human decision-making an explicit subject of economic analysis.

Behavioural findings have been applied to consumer protection, savings, health, education, energy use, taxation and public-service design. One influential application is choice architecture: the way options are presented or organized can affect decisions. A nudge is a change in that setting intended to make a choice easier without removing alternatives or relying on coercion. For example, a well-designed default can simplify enrolment while allowing people to opt out. Such interventions are hypotheses to evaluate, not guaranteed solutions; their effects should be tested in the setting where they will be used.

A behavioural effect measured in one experiment or population may not transfer unchanged to another context. Results depend on the decision, the people involved and the surrounding institutions, while markets and experience can sometimes reduce or alter the influence of particular patterns. Researchers therefore need robust methods and evaluation rather than assuming that an intervention will work everywhere. When behavioural insights are used in public policy, the OECD emphasizes ethical consideration throughout the process, from defining a problem to applying an intervention at scale. Questions about effectiveness, transparency and the appropriate role of government remain part of the field's discussion.