The Pioneers of Behavioral Economics

Herbert Simon (1916–2001)

An American polymath at Carnegie Mellon who worked across economics, cognitive psychology, political science, public administration and artificial intelligence, and won the 1978 Nobel Memorial Prize in Economics as well as the 1975 Turing Award in computer science. Simon is the intellectual grandfather of behavioral economics through his concept of bounded rationality: the recognition that human decision-makers face real limits on information, attention and computing power, and therefore cannot and do not optimise in the frictionless way standard theory assumed. His alternative was satisficing — searching for an option that meets an acceptable threshold rather than the single best one. Simon framed the problem and supplied the vocabulary that later researchers filled in, but he offered a broad principle rather than the specific, quantified model of how people deviate that prospect theory would later provide.

Daniel Kahneman (1934–2024)

An Israeli-American psychologist who, with Amos Tversky, founded the modern study of judgment and decision-making, and who received the 2002 Nobel Memorial Prize in Economics — an unusual award to someone who never took an economics course. His work with Tversky produced prospect theory (1979) and a catalogue of heuristics and biases: mental shortcuts such as availability, representativeness and anchoring that usually work but produce systematic errors in identifiable circumstances. His later synthesis, the bestseller Thinking, Fast and Slow (2011), organised decades of research around two modes of thought — System 1, fast and automatic, and System 2, slow and deliberate. Kahneman was scrupulous about crediting Tversky as an equal partner and, characteristically for a careful scientist, publicly revisited some of his own earlier claims in light of later evidence about replication.

Amos Tversky (1937–1996)

An Israeli cognitive psychologist and Kahneman's indispensable collaborator, whose partnership produced the foundational work of the field. Together they wrote the heuristics-and-biases papers of the early 1970s and prospect theory in 1979, work built on ingenious, carefully designed experiments that revealed the structure of human error. Tversky died in 1996, at 59, which carries real significance for the history of the field: when the Nobel Memorial Prize recognised this research in 2002, it went to Kahneman, because the prize is not awarded posthumously. It is widely and reasonably assumed that Tversky would have shared it had he lived. Kahneman consistently described the ideas as jointly theirs and spoke of the collaboration as the central intellectual relationship of his life. Tversky also did influential work on similarity, choice and the framing of decisions.

Richard Thaler (born 1946)

The American economist who did the most to bring behavioral insights into economics itself, for which he received the 2017 Nobel Memorial Prize. Where Kahneman and Tversky were psychologists studying the mind, Thaler was an economist asking what their findings meant for markets and policy. His contributions include mental accounting, the endowment effect, and sustained work on self-control problems and how people fail to act in their own long-term interest. His long-running Anomalies column documented systematic violations of standard theory. With Cass Sunstein he developed the idea of choice architecture and the nudge. His applied work includes the Save More Tomorrow programme, which uses automatic escalation and default enrolment to raise retirement saving — a concrete demonstration that understanding a bias can be turned into a practical design.

Cass Sunstein and Robert Shiller

Two figures extended behavioral ideas into adjacent domains. Cass Sunstein (born 1954) is an American legal scholar, not an economist, who co-authored Nudge (2008) with Thaler and later ran the White House Office of Information and Regulatory Affairs, translating choice-architecture ideas into regulatory practice. Robert Shiller (born 1946) is an economist who applied behavioral thinking to financial markets, arguing that asset prices are driven partly by psychology and narrative rather than by fundamentals alone; his book Irrational Exuberance (2000) warned of overvaluation shortly before the dot-com crash, and he shared the 2013 Nobel Memorial Prize — notably alongside Eugene Fama, whose efficient-markets view he disputed. Together these figures show how far behavioral economics reached beyond its psychological origins, into law, regulation and finance.