Behavioral Economics
What is Behavioral Economics?
Behavioral economics studies how psychological factors and cognitive biases cause people to make decisions that depart from pure rationality.
It combines economics and psychology to explain why people are often inconsistent, shortsighted, or influenced by how choices are framed. Findings like loss aversion and present bias refine the traditional assumption of perfectly rational agents.
Behavioral Economics: a worked example
A school cafeteria serves 300 lunches a day and keeps the salad bar at the far end of the line, past the pizza. Salads sell 45 a day, 15% of lunches. The kitchen moves the salad bar to the front and changes nothing else: same recipes, same $3.50 price, same students, same budgets. Salads now sell 90 a day, 30% of lunches. Standard demand analysis predicts no change, since neither price nor income moved. Behavioral economics predicts exactly this shift, because attention, effort and the order options appear in are inputs to choice. One layout change doubled salad sales.
The mistake students make with behavioral economics
The popular version of this field is that people are irrational, therefore economics is wrong. Neither half holds. The deviations behavioral economists document are systematic and predictable, which is the opposite of random irrationality, and that is why they can be modeled and tested at all. Behavioral economics adjusts the assumption of a perfect optimizer rather than discarding supply and demand, and its own models still rest on people pursuing what they want.
Behavioral Economics questions
What is the difference between behavioral economics and traditional economics?
Behavioral economics differs from traditional economics by dropping the assumption that people optimize perfectly while keeping the assumption that they pursue what they want. Traditional models ask what a consistent decision-maker should do with full information. Behavioral models ask what people measurably do when attention is limited, options are framed, reference points shift and self-control fails, then build that gap into the prediction rather than calling it noise.
What is a nudge in behavioral economics?
A nudge is a change in how choices are presented that shifts behavior without banning anything or moving prices much. Putting salad first in the lunch line is a nudge; taxing pizza is not, and removing pizza certainly is not. The test is whether someone who wants the old option can still take it at roughly the old cost. Default settings, reminders and reordered menus are the standard tools.
What are the main biases studied in behavioral economics?
Behavioral economics studies a short list of biases that show up again and again: loss aversion, where losses hurt more than equal gains please; anchoring, where an arbitrary first number drags later judgments toward it; present bias, where immediate rewards beat larger later ones; the sunk cost fallacy, where past spending drives current choices; and overconfidence in one's own estimates. Each recurs across many different choice settings, which is what makes them usable in models.
Related terms
Common comparisons
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