What is behavioral economics?
Standard economics models people as fully informed, utility-maximizing rational agents. Behavioral economics tests that assumption against real behavior, identifies where people systematically depart from it, and builds those patterns into economic models. Herbert Simon (1955) introduced bounded rationality: with limited information and brainpower, people settle for choices that are good enough.
What are the core ideas of behavioral economics?
| Concept | What it says | Example |
|---|---|---|
| Prospect theory and loss aversion | Losses hurt more than equal gains feel good (Kahneman & Tversky, 1979) | Holding on to losing stocks too long |
| Mental accounting | We label money and treat it differently (Thaler, 1980) | Blowing a bonus but pinching pennies on salary |
| Endowment effect | We value what we own more | Overpricing your stuff when selling it used |
| Present bias | Overweighting rewards now vs. later | Procrastinating on studying or saving |
| Confirmation bias | Seeking info that fits what we believe | Reading only news that backs your investment |
For loss aversion in markets, see behavioral finance; for biased information processing, see confirmation bias.
Nudges, policy, and criticism
Thaler and Sunstein (2008) proposed nudges: small changes in how choices are presented that steer people toward better decisions without restricting freedom. The classic example is automatic enrollment in retirement plans, now used in many countries. Critics point out that some lab findings haven't replicated and that many nudge effects are smaller than first reported, so the field now emphasizes large field experiments and preregistered studies. See nudge for more.
FAQ
- How is behavioral economics different from behavioral finance?
- Behavioral finance is a subfield that applies behavioral economics to financial markets and investing.
- What should I read to get started?
- Kahneman's Thinking, Fast and Slow and Thaler and Sunstein's Nudge are the most common starting points.
Sources reviewed: 2026-10-25
References
- Simon, H. A. (1955). A behavioral model of rational choice. Quarterly Journal of Economics, 69(1), 99–118.
- Kahneman, D., & Tversky, A. (1979). Prospect theory: An analysis of decision under risk. Econometrica, 47(2), 263–291.
- Thaler, R. H. (1980). Toward a positive theory of consumer choice. Journal of Economic Behavior & Organization, 1(1), 39–60.
- Thaler, R. H., & Sunstein, C. R. (2008). Nudge: Improving decisions about health, wealth, and happiness. Yale University Press.