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Portrait of Daniel Kahneman
Photo: nrkbeta, IMG_4330 · CC BY-SA 2.0 via Wikimedia Commons

Sveriges Riksbank Prize in Economic Sciences · 2002

Daniel Kahneman

He showed that human judgment goes wrong in predictable ways, reshaping economics and how governments help people save.

The Nobel citation: “for having integrated insights from psychological research into economic science, especially concerning human judgment and decision-making under uncertainty”
Born
March 5, 1934, Tel Aviv, British Mandate of Palestine (now Israel)
Died
March 27, 2024
Shared with
Vernon L. Smith
Affiliation at the time
Princeton University, USA

Economics prize

2002

Shared with 1 other laureate.

Age that year

68years

Born in 1934.

Headline credited impact

850,000–1.4 millionpeople benefited

Extra workers saving for retirement because of automatic-enrolment defaults (UK and US). How it was built

Sources cited

21

Fact-checked September 24, 2026.

  • He won the Nobel in economics as a psychologist, and said he learned most of his economics in one year working with Richard Thaler and Jack Knetsch.
  • As a boy in Nazi-occupied Paris he wore the yellow star; his father was held for six weeks at Drancy, the camp through which most Jews deported from France passed.
  • At 21, as an Israeli army lieutenant, he designed an interview system for recruits that stayed in use, little changed, for decades.
  • He and Amos Tversky tossed a coin to decide whose name went first on their first joint paper, then took turns after that.
  • In 2017 he publicly admitted that his bestseller Thinking, Fast and Slow had put too much faith in small, weak studies of priming.

The breakthrough

Mapping the predictable errors of human judgment and choice (1971-1979)

Kahneman and his friend Amos Tversky asked a simple question: how do real people decide when the outcome is uncertain? Economists had long assumed people act like careful calculators. Kahneman and Tversky tested this with short, clever questions and found that people lean on mental shortcuts, which they called heuristics. The shortcuts usually work, but they also produce errors that are predictable. For example, people judge how common something is by how easily examples come to mind. And after a coin lands heads a few times in a row, many people feel that tails is 'due', even though every toss is still 50-50. Their second big idea, prospect theory (1979), described how people choose between risky options. People judge outcomes as gains or losses compared with where they stand now, not by their total wealth. And a loss hurts more than an equal gain pleases: most people refuse a coin-toss bet that risks $20 unless the possible win is at least $40. This is called loss aversion. They also showed that describing the same choice as lives saved or as lives lost can flip what people pick, an effect called framing. Think of the mind as a fast autopilot plus a slower, careful pilot. The autopilot handles most of life well, but it makes the same kinds of mistakes again and again, and the careful pilot does not always catch them. Kahneman later used the labels System 1 and System 2 for these two modes.[2],[3],[4],[5]

“It felt like being hunted. We had the mentality of rabbits.”
Daniel Kahneman, Recalling his family's flight through Nazi-occupied France, in a 2015 interview with The Guardian.[6]

What it meant for humanity

Before Kahneman and Tversky, economics mostly assumed that people weigh costs and benefits correctly. Their experiments showed that people make mistakes that follow patterns, and patterns can be studied and planned for. That shift changed how governments, doctors, businesses and ordinary readers think about decisions. The clearest example is saving for retirement. Because people tend to stick with whatever option is already set, making saving the default, with the right to opt out, sharply raises the number of savers. Behavioral economists such as Richard Thaler, building on prospect theory and loss aversion, helped turn this into policy. In the UK, automatic enrolment began in 2012. By 2018 the number of eligible employees saving in a workplace pension had risen from 10.7 million to 18.7 million, and by the end of 2025 employers had automatically enrolled about 11.4 million workers. In US retirement plans run by Vanguard in 2024, 94% of eligible workers took part when enrollment is automatic, against 64% when they had to sign up themselves. Britain and the United States created 'nudge' units to apply such insights across government, and a 2015 US executive order called on federal agencies to use behavioral science. Kahneman's work on memory reached medicine too. In a trial with 682 patients, adding a short, less painful stretch to the end of a colonoscopy made patients remember it as less unpleasant, and they were slightly more likely to come back for a repeat colonoscopy. His 2011 book Thinking, Fast and Slow sold millions of copies and gave the public words for its own mental shortcuts.

  • As of 2006, Kahneman and Tversky's 1979 prospect theory paper was the second most cited article published in major economics journals since 1970, with 4,085 citations.[9]
  • UK automatic enrolment, which the government says rests on behavioural principles, had signed up about 11.4 million workers by the end of 2025, employer returns show.[11],[12]
  • In US retirement plans run by Vanguard, automatic enrollment went with 94% participation in 2024, compared with 64% where workers had to sign up on their own.[13]
  • A randomized trial with 682 colonoscopy patients applied his finding that we remember the worst and last moments of pain: a less painful ending made the procedure remembered as less unpleasant.[2],[17]
  • The structured interview he designed for Israeli army recruits in 1955 raised the accuracy of predictions about soldiers and stayed in use for decades.[2]
  • A 2015 US executive order called on federal agencies to apply behavioral science, noting that automatic enrollment and escalation had helped Americans save billions of dollars more for retirement.[14]

Impact in numbers

Kahneman's main contribution is a change in how people understand decisions, and that resists precise counting. With Amos Tversky he gave economics, medicine, law, finance and public policy a tested map of where human judgment goes wrong, and helped launch behavioral economics. We record one conservative, low-confidence number: extra workers saving for retirement in the UK and US because saving became the default. We credit Kahneman with only 5% of it, because Tversky shared the underlying work and Richard Thaler, Shlomo Benartzi, Cass Sunstein and policymakers turned the theory into working policy. Much of his influence cannot be counted: doctors thinking about how patients remember pain, planners wary of overconfidence, organizations trying to reduce inconsistent judgments, and millions of readers who learned to question their snap judgments. Tversky, who died in 1996 before the prize, deserves equal credit for the joint work.

EconomyHealthEducationFundamental science

Each number is the laureate’s credited share of a real-world outcome, cumulative to 2025. The whole outcome, the share of credit, and the reasoning are shown so you can check the arithmetic. Outcomes shared with other laureates are counted once on the impact page.

  • Low confidenceRippleModeledEconomy

    Extra workers saving for retirement because of automatic-enrolment defaults (UK and US)

    850,000–1.4 million

    people benefited, credited share

    That is 5% of 17–28 million people benefited since 2006.

    How this number was built

    Pension defaults only, UK and US, so a floor. UK: DWP found eligible employees in workplace pensions rose from 10.7M (2012) to 18.7M (2018), +8.0M (low); TPR counts 11.385M auto-enrolled by Dec 2025, less ~9% opt-outs = 10.4M (high). US: Vanguard cites >100M Americans with DC accounts; we use 80-100M to allow for people with several accounts. Vanguard auto-enroll plans have 94% participation vs 64% without (+30 points; cross-sectional, not a clean causal estimate). Assume 40-60% of covered workers are in auto-enroll plans (61% of Vanguard plans, 78% of large ones, use it): 80-100M x 0.4-0.6 x 0.30 = 9.6M-18M. Total ~17M-28M; other countries excluded. Share 0.05: Kahneman's half of the Kahneman-Tversky foundation (loss aversion, reference dependence); Thaler, Benartzi, Madrian, Sunstein and policymakers built the policies (foundational range 0.01-0.1).[2],[10],[11],[12],[13]

    Sources: NobelPrize.org (from Les Prix Nobel 2002); NobelPrize.org (Royal Swedish Academy of Sciences); UK Department for Work and Pensions; The Pensions Regulator (UK); Vanguard

The double edge

Kahneman's work is not tied to physical harm, but it carries real controversies. The most serious concerns his bestseller. Thinking, Fast and Slow presented striking studies of priming, the idea that subtle cues can steer behavior without our awareness, as settled science. Many of those studies later failed to replicate. In 2012 Kahneman urged priming researchers to shore up their field, and in 2017 he admitted he had trusted small, underpowered studies too readily, an irony, since his first paper with Tversky warned scientists against exactly that mistake. Critics such as Gerd Gigerenzer long argued that the heuristics-and-biases research exaggerated human irrationality; Kahneman answered that it only refuted an unrealistic ideal of rationality. Nudges, the policy tools that grew from this research, are debated as well: a 2022 reanalysis argued that after correcting for publication bias there was no clear evidence that nudges work on average. And the same insights that help design better choices can be turned against people, as the Royal Swedish Academy of Sciences noted about common marketing tactics in its 2017 prize explainer.

  • Moderate

    Priming studies in his bestseller did not hold up

    Chapter 4 of Thinking, Fast and Slow (2011) presented a set of social priming experiments as findings readers had to accept. After key studies failed to replicate, Kahneman wrote to priming researchers in 2012 urging them to rebuild trust through replication. In 2017 he conceded that he had trusted small, statistically weak studies too readily and that the chapter's evidence was far weaker than he had thought when he wrote it.[15],[16]

  • Minor

    How well nudges work is contested

    A large meta-analysis of more than 200 studies, published in PNAS in January 2022, found that choice-architecture nudges have small-to-medium effects on average, with moderate publication bias. A reanalysis later that year in the same journal argued that after adjusting for that bias there was no clear evidence of an average effect. Default settings such as automatic pension enrolment remain among the better-documented cases.[11],[13],[18],[21]

  • Minor

    Knowledge of biases can be used to exploit people

    Knowing that people fear losses and respond to framing can help design better choices, but it also helps sellers push worse ones. The Royal Swedish Academy of Sciences' 2017 explainer on behavioral economics notes that familiar marketing tactics, from multi-buy offers to lottery ads that spotlight rare winners, take advantage of these tendencies.[10]

  • Minor

    Critics said the research overstated human irrationality

    Psychologists including Gerd Gigerenzer and Lola Lopes argued that the heuristics-and-biases program judged people against the wrong standards and exaggerated the flaws of human thinking. Kahneman acknowledged that his work was often read as claiming people cannot think straight, and said it only refuted an unrealistic model of perfect rationality.[2]

Against the odds

Kahneman's parents were Lithuanian Jews who had moved to France in the early 1920s, when France was one of the more welcoming countries for Jewish immigrants. They did well there but never felt fully secure. The German invasion of 1940 ended what security they had. In occupied Paris, Jews faced antisemitic laws and round-ups, and from June 1942 they had to wear a yellow star; Kahneman wore one as a boy and kept to a curfew for Jews. In 1941 his father was seized in an early mass round-up of Jews in Paris and held for six weeks at Drancy, the camp through which most Jews deported from France passed. About 64,000 Jews were deported from Drancy, and fewer than 2,000 of them survived. His father was freed through his employer, whose head, Kahneman later learned, had been a chief financial backer of France's fascist, antisemitic movement in the 1930s. The family fled to the Riviera, and when German troops reached it they moved from village to village, ending up in a converted chicken coop in central France. As a boy he prayed simply to survive one more day. His father, a diabetic, died in 1944 without proper treatment, six weeks before D-Day. In all, some 77,000 Jews living in France perished. In 1946 his mother took him and his sister to Palestine. Kahneman himself played down his ordeal, saying it was nothing compared with other Jewish stories.

  • 1941

    Persecution

    His father was arrested in an early mass round-up of Jews in Paris and interned for six weeks at Drancy, which became the main transit camp for deporting Jews from France to Auschwitz. Kahneman, then seven, remembered a French policeman outside telling visitors that the prisoners were eating vegetable peelings.[2],[6],[7]

  • 1942

    Discrimination

    Under German occupation, Jews in Paris were forced to wear the yellow star and obey a curfew. Kahneman once turned his sweater inside out to hide the star while hurrying home after curfew.[2],[8]

  • —

    Exile

    The family escaped Paris to the Riviera and, after German troops arrived there, fled again from village to village to central France, living for a time in a converted chicken coop.[2],[5],[6]

  • 1944

    War

    While the family was in hiding, his father died of diabetes that could not be properly treated, six weeks before the D-Day landings. Kahneman was ten.[2],[5],[6]

Jewish background

Both parents JewishIdentified as Jewish, secular

Kahneman was born in Tel Aviv to Lithuanian Jewish parents, Rachel and Efrayim, who had settled in Paris in the early 1920s. He grew up in Paris and lived through the Nazi occupation as a Jewish child, wearing the yellow star and later hiding with his family. He wrote that, like many Jews, he grew up in a world made of people and words. After the war he moved with his mother and sister to Palestine and became Israeli, later also holding US citizenship. As a teenager he was more curious about why people believe in God than about whether God exists. He called himself far to the left in Israeli politics and said he had opposed the occupation from the start.[2],[4],[5],[6],[20]

Key dates

  1. March 5, 1934

    Born in Tel Aviv, in Mandatory Palestine, while his mother was visiting family; the family's home was in Paris.[1],[2]

  2. 1941

    His father is seized in a round-up of Jews in occupied Paris and held for six weeks at the Drancy internment camp.[2],[6],[7]

  3. 1944

    His father dies of poorly treated diabetes six weeks before D-Day, after the family fled Paris for the south and then central France.[2],[5],[6]

  4. 1946

    Moves with his mother and sister to Palestine, soon to become Israel.[5],[6]

  5. 1955

    After a degree in psychology and mathematics at the Hebrew University, designs a structured interview for Israeli army recruits that is used for decades.[2]

  6. 1961

    Earns his PhD in psychology at the University of California, Berkeley, and returns to teach at the Hebrew University.[2],[4]

  7. 1969

    Begins his collaboration with Amos Tversky after inviting him to speak at a Hebrew University seminar.[2]

  8. 1974

    Publishes 'Judgment under Uncertainty: Heuristics and Biases' with Tversky in Science.[2]

  9. 1979

    Publishes prospect theory with Tversky in Econometrica, introducing loss aversion to economics.[2],[9]

  10. 1993

    Joins Princeton University as a professor of psychology and public affairs, after posts in British Columbia and Berkeley.[2],[4]

  11. October 9, 2002

    Awarded the Nobel Memorial Prize in Economic Sciences, shared with Vernon L. Smith; Tversky had died in 1996.[1],[4]

  12. 2011

    Publishes Thinking, Fast and Slow, which sells millions of copies worldwide.[5],[6]

  13. November 20, 2013

    Receives the Presidential Medal of Freedom, the highest US civilian honor, from President Barack Obama.[19],[20]

  14. March 27, 2024

    Dies at age 90.[1],[5]

Sources

  1. 1.Daniel Kahneman - Facts · NobelPrize.org (Nobel Prize Outreach)
  2. 2.Daniel Kahneman - Biographical (autobiography, with eulogy for Amos Tversky) · NobelPrize.org (from Les Prix Nobel 2002), 2003
  3. 3.Maps of Bounded Rationality: A Perspective on Intuitive Judgment and Choice (Prize Lecture, 8 December 2002) · NobelPrize.org, 2002
  4. 4.The Prize in Economic Sciences 2002 - Press release · NobelPrize.org (Royal Swedish Academy of Sciences), 2002
  5. 5.Daniel Kahneman obituary (Georgina Ferry) · The Guardian, 2024
  6. 6.Daniel Kahneman: 'What would I eliminate if I had a magic wand? Overconfidence' (interview by David Shariatmadari) · The Guardian, 2015
  7. 7.Drancy · United States Holocaust Memorial Museum, Holocaust Encyclopedia
  8. 8.France · United States Holocaust Memorial Museum, Holocaust Encyclopedia
  9. 9.What Has Mattered to Economics Since 1970 (Kim, Morse and Zingales), NBER Working Paper 12526 · National Bureau of Economic Research, 2006
  10. 10.Easy money or a golden pension? Integrating economics and psychology (Popular science background, Prize in Economic Sciences 2017) · NobelPrize.org (Royal Swedish Academy of Sciences), 2017
  11. 11.Automatic enrolment evaluation report 2019 · UK Department for Work and Pensions, 2019
  12. 12.Automatic enrolment declaration of compliance report · The Pensions Regulator (UK), 2026
  13. 13.How America Saves 2025 · Vanguard, 2025
  14. 14.Executive Order: Using Behavioral Science Insights to Better Serve the American People · The White House (Obama administration archive), 2015
  15. 15.Reconstruction of a Train Wreck: How Priming Research Went off the Rails (Ulrich Schimmack), with Daniel Kahneman's reply of 14 February 2017 · Replicability-Index, 2017
  16. 16.Nobel laureate challenges psychologists to clean up their act (Ed Yong) · Nature, 2012
  17. 17.Memories of colonoscopy: a randomized trial (Redelmeier, Katz and Kahneman), Pain 104:187-194 · PubMed (US National Library of Medicine), 2003
  18. 18.No evidence for nudging after adjusting for publication bias (Maier et al.), PNAS 119(31) · PubMed (US National Library of Medicine), 2022
  19. 19.Remarks by the President at Presidential Medal of Freedom Ceremony (20 November 2013) · The White House (Obama administration archive), 2013
  20. 20.Nobel Prize-winning psychologist Daniel Kahneman dies aged 90 (Eliana Jordan) · The Jewish Chronicle, 2024
  21. 21.The effectiveness of nudging: A meta-analysis of choice architecture interventions across behavioral domains (Mertens et al.), PNAS 119(1) · PubMed (US National Library of Medicine), 2022

Fact-checked on September 24, 2026 by a separate AI fact-checking pass that re-opened the sources, with 14 corrections made. How we check

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