Books written by
The behavioral economist who made “predictably irrational” a household phrase — and became a case study in his own subject matter
Dan Ariely built a career on a deceptively simple idea: people don’t make random bad decisions, they make the same bad decisions, over and over, in ways that can be predicted and studied. That question grew out of his own recovery from severe burns as a teenager, where the gap between what felt like good treatment and what actually reduced pain never left him. It made him one of the most widely read popularizers of behavioral economics of the last two decades, currently the James B. Duke Professor of Psychology and Behavioral Economics at Duke University.
Below is his bibliography in order, with my honest take on each one — including where his own research has come under fire — a quick-facts box, his own TED talk on video, and an FAQ. If this kind of “why do people actually behave this way” territory interests you, I’ve also written about Jonathan Haidt.
Sources: Wikipedia, Duke Fuqua School of Business, and Ariely’s own publisher bios. Last updated July 2026.
Dan Ariely (born 1967) is an Israeli-American behavioral economist at Duke University, best known for Predictably Irrational (2008), which argues that people make irrational decisions in ways that are systematic and predictable, not random. He has written seven books on decision-making, honesty, and money. Since 2010, several of his own studies have faced public criticism over data reliability, including one retracted paper, and in 2026 a long-standing personal connection to Jeffrey Epstein came to light, which Ariely says was unrelated to Epstein’s crimes.
“We are pawns in a game whose forces we largely fail to comprehend.”
— Predictably Irrational (2008)
Quick facts
Worth knowing
Since 2010, several of Ariely’s own studies and public statements have faced criticism over data reliability, and at least one paper he co-authored was retracted after an investigation found falsified data; Duke University has not publicly commented on his individual role. In 2026, it was also reported that Ariely had a long-standing personal relationship with Jeffrey Epstein, which he has denied was connected in any way to Epstein’s crimes. Neither of these erases the value of his core research area, but they’re worth knowing before treating any single study of his as settled fact — see the notes under The Honest Truth About Dishonesty and Misbelief below.
His breakout book
Predictably Irrational: The Hidden Forces That Shape Our Decisions
The book that made Ariely’s name, built almost entirely out of small, elegant experiments — on pricing, on placebo effects, on why a “free” option distorts a decision out of all proportion to its actual value. Each chapter lands a genuine “wait, that’s me” moment.
This is still the right place to start, and it holds up better than most 2008-era pop-science because it never over-claims: he’s careful to argue irrationality is systematic, not stupidity. The weakest chapters are the ones that feel most like TED-talk filler; the strongest ones I still think about years later.
The Upside of Irrationality: The Unexpected Benefits of Defying Logic at Work and at Home
Moves from workplace motivation and revenge to grief, adaptation, and online dating — a wider, more personal range of subjects than the first book covered.
Honestly the more emotionally interesting of the two, though less tightly structured — it reads more like a collection of research he found interesting than a single argument. Satisfying, but looser than Predictably Irrational.
The Honest Truth About Dishonesty: How We Lie to Everyone – Especially Ourselves
Argues that almost everyone cheats a little, and that the size of a temptation matters less than how easily we can rationalize it to ourselves.
The core argument is genuinely useful and still gets cited constantly — but I’ll say directly what most write-ups of this book skip: some of Ariely’s own research from this period has since been publicly scrutinized over data integrity, including at least one retracted paper, and Duke has not commented on his role. That doesn’t erase the book’s central insight, which rests on a much wider body of research than his alone, but it’s worth knowing before taking every study inside it at face value.
Watch: an animated summary of The Honest Truth About Dishonesty
RSA Animate turned a 2012 talk by Ariely into this illustrated explainer on why honest people cheat a little — using the financial crisis as his central example of how a whole system can quietly nudge people into situations that distort their judgment.
Irrationally Yours
A collection of his “Ask Ariely” advice column from The Wall Street Journal, answering reader questions through a behavioral-economics lens.
The lightest thing he’s written — fun in short bursts, forgettable as a whole. Good for a nightstand book, not a priority if you’ve already read the three above it.
Payoff: The Hidden Logic That Shapes Our Motivations
A short TED Books entry on motivation — why meaning moves people more than money, and why badly designed incentive schemes backfire.
Essentially a long essay rather than a full book, and reads that way. Useful if you want the core idea in an hour; skippable once you’ve absorbed his other work.
Dollars and Sense: How We Misthink Money and How to Spend Smarter
Applies Ariely’s framework specifically to money: why we feel pain differently paying cash versus card, and why “relative” pricing tricks us on big purchases.
The most practically useful of his lighter books if your actual goal is spending less irrationally, though it repeats a fair amount of ground already covered in the earlier titles.
Misbelief: What Makes Rational People Believe Irrational Things
Explores how ordinary, otherwise-reasonable people end up believing conspiracy theories and misinformation, written after Ariely himself became a target of pandemic-era conspiracy theories.
His most self-implicated book, and a genuinely strange one to read alongside his own history: some of what made him a conspiracy-theory target was the reproducibility criticism of his earlier research. Read on its own it’s a solid account of misbelief as a process; read in context, it’s someone examining a phenomenon he’d also become a case study in.
Watch: Dan Ariely on whether we’re in control of our own decisions
Ariely’s own TED talk, using classic visual illusions and his research to show how people are less rational than they think when making decisions.
Frequently asked questions
What is Dan Ariely’s most famous book?
Predictably Irrational (2008) is Dan Ariely’s most famous book and the one that established him as a leading popularizer of behavioral economics.
What order should I read Dan Ariely’s books in?
Publication order works well: start with Predictably Irrational, then The Upside of Irrationality, then The Honest Truth About Dishonesty, before moving on to his shorter, lighter titles.
Has Dan Ariely’s research been criticized?
Yes. Since 2010, several of his studies and statements have faced public criticism over data reliability, and at least one paper he co-authored was retracted after an investigation found falsified data. Duke University has not publicly commented on his individual culpability.
Is Dan Ariely connected to Jeffrey Epstein?
In 2026, it was reported that Ariely had a long-standing personal relationship with Jeffrey Epstein. Ariely has denied any connection to or knowledge of Epstein’s crimes.
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Written by Lisanne Swart
Lisanne curates books for curious readers at lisannewart.com, publishing original reading lists, author deep-dives, and honest recommendations since 2021. Read more about Lisanne.
