Psychology › Thinking, memory & biases › Behavioral economics
Richard Thaler
Born 1945; Nobel 2017· Psychologist or thinker
Well replicatedStrong, repeated evidence.
American economist who brought psychology into mainstream economics, co-wrote Nudge, and won the 2017 Nobel in economics.
See it on the Psychology map →What it says
Born in 1945 in New Jersey, Thaler was a young economist at the University of Rochester when he began listing 'dumb stuff people do' that standard theory could not explain. He spent 1977–78 at Stanford with Kahneman and Tversky, coined the 'endowment effect' (1980) and 'mental accounting', and wrote an 'Anomalies' column for an economics journal from 1987. With Shlomo Benartzi he designed Save More Tomorrow; with Cass Sunstein he wrote Nudge (2008). He teaches at the University of Chicago.
Why it matters
He made behavioral ideas respectable in economics and practical in policy: automatic enrollment and automatic contribution increases in 401(k) plans now help millions save more.
Legacy and how the work held up
Well replicated core findings. His papers, Nobel citation and memoir Misbehaving (2015). In Save More Tomorrow's first trial, participants' savings rates rose from 3.5% to 13.6% over 40 months.
Open questions
Critics debate whether nudges are subtly paternalistic and how much they achieve at scale; Thaler counters that people always remain free to opt out.
Connections (4)
▸Richard Thaler helped found Behavioral economicsWell replicated
The connection
Thaler turned scattered oddities into a field. His 1980 paper 'Toward a Positive Theory of Consumer Choice' applied prospect theory to everyday spending; his 'Anomalies' columns from 1987 cataloged market puzzles; and he built networks and trained students who spread the approach through economics and finance.
Who showed it and when
Rochester in the 1970s, then Cornell and the University of Chicago; with Robert Shiller he ran a behavioral finance workshop at the National Bureau of Economic Research from 1991.
The evidence
His 2017 Nobel citation credits him with bringing psychology into economic analysis of decisions; his 1980 paper is widely cited as a founding text.
Open questions
Whether Thaler, Kahneman and Tversky, or earlier figures such as Herbert Simon best deserve the 'founder' title is a matter of emphasis.
▸Richard Thaler co-authored the book on Nudges and choice architectureWell replicated
The connection
Thaler, an economist, teamed with legal scholar Cass Sunstein to turn behavioral findings, including his own on mental accounting and self-control, into a policy program. Their 2008 book Nudge named the approach and made its case to a wide audience; Sunstein then ran the White House regulatory office from 2009 to 2012, applying it to US rules.
Who showed it and when
Written at the University of Chicago and published in 2008; a revised 'Final Edition' appeared in 2021.
The evidence
The book itself, plus direct credit from governments, such as Britain's Behavioural Insights Team, founded in 2010 and nicknamed the Nudge Unit.
Open questions
How much credit Thaler deserves versus the wider field, and whether nudges' real-world effects match the book's optimism, given smaller results at scale.
▸Richard Thaler proposed Mental accountingWell replicated
The connection
Standard economics treats money as fungible: any dollar can replace any other. Thaler noticed people don't act that way. They budget in mental buckets, spend windfalls freely and protect 'savings' even while paying credit-card interest. He formalized these patterns as mental accounting, explaining everyday choices that rational-agent models could not.
Who showed it and when
Thaler's 1980 paper 'Toward a Positive Theory of Consumer Choice' and his 1985 Marketing Science paper, written while at Cornell University.
The evidence
His papers set out the theory, and the 2017 Nobel committee cited mental accounting as one of his key contributions.
Open questions
Whether mental accounting is one theory or a useful label for several separate habits; it predicts less precisely than prospect theory does.
▸Richard Thaler named Endowment effect: valuing what we own moreWell replicated
The connection
Thaler noticed oddities like a colleague who would not sell wine he had bought for about $5 a bottle even for $100, yet would not pay more than $35 for another. In his 1980 paper he named this 'the endowment effect' and linked it to loss aversion; he later co-ran the mug experiments.
Who showed it and when
University of Rochester in the 1970s, where Thaler observed economist Richard Rosett; published in 'Toward a Positive Theory of Consumer Choice', 1980.
The evidence
The 1980 paper coins the term, and Thaler recounts its origin in his memoir Misbehaving (2015).
Open questions
Gaps between willingness to pay and to accept had appeared in early-1970s studies of hunting rights; Thaler's contribution was the name and the explanation.