Predictably Irrational: Difference between revisions
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== Introduction ==
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| pages = 280
| isbn = 978-0-06-135323-9
| goodreads_rating = 4.11
| goodreads_rating_date = 8 November 2025
| website = [https://predictablyirrational.com predictablyirrational.com]
}}
📘 '''''{{Tooltip|Predictably Irrational}}''''' distills {{Tooltip|Dan
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== Chapters ==
''This outline follows the Harper hardcover first edition (2008), ISBN 978-0-06-135323-9.''<ref name="OCLC182521026">{{cite web |title=Predictably irrational : the hidden forces that shape our decisions |url=https://search.worldcat.org/title/-/oclc/182521026 |website=WorldCat.org |publisher=OCLC |access-date=8 November 2025}}</ref><ref name="CUP2009">{{cite news |title=Predictably Irrational: The Hidden Forces That Shape Our Decisions (review) |url=https://www.cambridge.org/core/journals/journal-of-pension-economics-and-finance/article/predictably-irrational-the-hidden-forces-that-shape-our-decisions-dan-ariely-harper-collins-2008-isbn-9780061353239-304-pages/D2E1F04A0FFA64BEC4406A6C1DD7A41B |work=Journal of Pension Economics & Finance |publisher=Cambridge University Press |date=15 April 2009 |access-date=8 November 2025}}</ref>▼
=== Chapter 1 – The truth about relativity : why everything is relative, even when it shouldn't be ===
🚦
=== Chapter 2 – The fallacy of supply and demand : why the price of pearls, and everything else, is up in the air ===
📈
=== Chapter 3 – The cost of zero cost : why we often pay too much when we pay nothing ===
🆓
🤝 The {{Tooltip|American Association of Retired Persons (AARP)}} once asked lawyers to provide services to needy seniors at a steep discount—about $30 per hour—and found few takers; when the request was reframed as pro bono, many agreed. In Israel, {{Tooltip|Uri Gneezy}} and {{Tooltip|Aldo Rustichini}} studied 10 {{Tooltip|Haifa}} day-care centers over 20 weeks: after four baseline weeks they introduced a fine (10 {{Tooltip|New Israeli Shekels}} for pickups after 16:10) in six centers, lateness rose and stayed high, and removing the fine didn’t reverse the effect. In lab tasks, small cash payments shifted people into a “market” mindset and reduced effort, while gifts or no pay kept behavior in the “social” domain and elicited more help. When money enters, people start calculating against wages and prices; when it doesn’t, they respond to relationships, reciprocity, and reputation. The pattern is robust across settings where a token payment crowds out the warm pull of social obligation. We inhabit two exchange systems—social and market norms—and money cues flip the frame; once market norms dominate, generosity recedes and behavior becomes price-sensitive.
🔥 At the {{Tooltip|University of California, Berkeley}}, 35 male undergraduates completed a two-condition experiment on a laptop: in a neutral state and in a sexually aroused state induced by self-stimulation, with responses recorded only when an on-screen “arousal thermometer” read at least 75 percent. Using a one-hand keypad while viewing erotic images, the same participants rated the appeal of sexual scenarios, their willingness to use coercive tactics to obtain sex, and their likelihood of forgoing condoms. Across measures, answers in the aroused state were consistently riskier and less restrained than the answers the same men had given while calm. Crucially, when cool they also underestimated how much arousal would shift their judgments. The results show a stable gap between how we think we’ll behave and what we endorse in the “heat of the moment.” Visceral states predictably reshape preferences; from a cool state we misread the hot one, so precommitments that block temptation are the practical response.
⏳ Teaching at {{Tooltip|MIT}}, three sections facing three term papers became a natural experiment: one section had three fixed, evenly spaced deadlines; one could set its own binding deadlines with a grade penalty of 1 percent per day late; and one had a single end-of-term deadline. When grades came back, the fixed-deadline section performed best, the self-scheduled section landed in the middle, and the single-deadline section did worst. A separate proofreading study paid 10 cents per detected error and penalized $1 per day of delay; participants given evenly spaced due dates found more errors and earned more than those with self-set deadlines, who in turn outperformed those with one final deadline. People recognize their tendency to delay and will precommit, but they don’t set optimal constraints without help. Present-biased preferences derail plans; external structure and credible self-binding—calendars, staged penalties, automatic rules—pull work forward and align actions with future goals. ''Giving up on our long-term goals for immediate gratification, my friends, is procrastination.''
🏠 In the spring of 1994 at {{Tooltip|Duke University}}, students camped out to earn lottery numbers for a tiny, thunder-loud basketball arena, then crowded the student center to see who had actually won tickets. Watching with {{Tooltip|Ziv Carmon}}, I used this natural experiment to call newly minted “owners” and non-winners: sellers, imagining the game they would forgo, asked on average about $2,400; buyers, picturing the cash they would part with, offered about $175—a fourteen-to-one gap. Auctions revealed the same pull: the longer someone led the bidding, the stronger the feeling of “virtual ownership,” and the more they would pay to avoid the loss. Trials and money-back guarantees exploit that pre-ownership—try a “digital gold” cable package and loss aversion makes downgrading feel painful even if the price isn’t worth it. We also cling harder to things we’ve worked on (assembling furniture) and assume others see our beloved possessions through our eyes, which inflates our selling prices. Loss aversion drives the endowment effect: once something feels “mine,” surrendering it looms as a loss, so we overvalue it; choosing from a non-owner’s vantage can blunt the bias. ''THERE IS NO known cure for the ills of ownership.''
🚪 A focusing parable comes from 210 BC: {{Tooltip|Xiang Yu}} burned his boats and smashed the cooking pots so his army had to win or perish, and they won nine straight battles. To see how modern minds handle closure, we built a “door game” in {{Tooltip|MIT’s East Campus}}: three colored rooms paid uncertain amounts per click over a 100-click budget. In a variant, any door left alone for 12 clicks shrank and disappeared, and participants began wasting clicks just to keep every door alive, even when one room was clearly better. They earned about 15 percent less than participants who never faced closing doors, and when we made reopening a door cost three cents, the wasted clicking continued. Even a “reincarnating” door that could be brought back at no cost still drew defensive clicks, as if mere disappearance were intolerable. The habit scales up: we overbuy “expandable” gear, hoard warranties “just in case,” and spread ourselves thin across activities to avoid saying no. An aversion to irreversible loss, amplified by regret and attention capture, makes us pay to preserve options that drain effort from the best one; closing doors deliberately restores focus and returns. ''We have an irrational compulsion to keep doors open.''
🎭 At the {{Tooltip|Muddy Charles}}, an {{Tooltip|MIT}} pub, we poured two small samples—{{Tooltip|Budweiser}} and “{{Tooltip|MIT Brew}},” Budweiser with two drops of balsamic vinegar per ounce. Without prior information, most tasters chose the vinegar-laced beer; when told beforehand about the vinegar, many wrinkled their noses and picked the standard brew. Timing mattered: if we revealed the vinegar only after the tasting, preferences stayed high for the MIT Brew, matching the blind condition, and more people later added vinegar themselves when given droppers and the recipe. In a campus coffee stand, the same coffee tasted “better” when odd condiments sat in glass-and-metal containers on a brushed-metal tray with silver spoons than when they sat in jagged Styrofoam cups with red felt-tip labels; ambience shaped both liking and willingness to pay. Expectation also shows up in the brain: brand cues for familiar colas can shift neural responses alongside reported taste. Top-down prediction bends sensation toward belief; manage cues upfront and delay negative frames to steer experience.
💊 In 1955 the {{Tooltip|Seattle}} cardiologist {{Tooltip|Leonard Cobb}} ran a bold sham-surgery trial on internal mammary artery ligation for angina: half the patients received the full procedure and half a placebo operation, and the outcomes were indistinguishable—an early, striking demonstration of placebo power. Building on that logic, a lab study attached volunteers to electrodes and administered randomized electric shocks, then gave them a capsule called {{Tooltip|Veladone-Rx}}; when the brochure listed the price as $2.50 per pill, most participants reported clear pain relief, but when the same capsule (vitamin C) was discounted to 10 cents, far fewer felt better. A campus field test with {{Tooltip|SoBe}} energy drink made the point concrete: students who paid full price solved about nine of fifteen word puzzles, while those who bought SoBe at a discount averaged 6.5—roughly a 28% drop. When the quiz booklet primed expectations with “more than 50 scientific studies,” performance rose for everyone, but it rose far more for the full-price group (about 3.3 additional correct answers versus 0.6 for the discount group). Reflection weakened the effect: asking people to stop and consider the relationship between price and quality reduced the discount penalty. Price sets expectations, and expectations shape experience—even for pain; place and presentation cue the mind’s script, turning marketing signals into self-fulfilling effects. ''The truth is that placebos run on the power of suggestion.''
🕵️ At {{Tooltip|Harvard Business School}}, undergraduates and MBAs took a 50-question multiple-choice quiz in 15 minutes for 10 cents per correct answer; a control group, which couldn’t cheat, averaged 32.6. When a second group saw the answer key while transferring responses, claimed scores jumped to 36.2; when another group shredded their worksheets before reporting, the average was 35.9; even when they shredded both worksheet and bubble sheet and paid themselves from a coin jar, the mean stayed near 36.1. Replications at {{Tooltip|MIT}}, {{Tooltip|Princeton}}, {{Tooltip|UCLA}}, and {{Tooltip|Yale}} showed the same pattern: many people cheat, but only a little, and increasing the chance of getting away with it doesn’t unleash rampant fraud. A moral nudge changed everything: when participants first tried to recall the {{Tooltip|Ten Commandments}}, cheating fell to zero and the average score matched the no-cheating control (about three correct on a shorter matrix task), whereas recalling ten books left room for the usual modest cheating. Signing an honor statement before the task produced the same effect—even at MIT, which doesn’t have an honor code. A small “fudge factor” lets people cheat without losing a moral self-image, yet timely moral salience tightens that self-accounting and stops cheating. ''But if we are reminded of morality at the moment we are tempted, then we are much more likely to be honest.''
💵 In {{Tooltip|MIT dorms}}, six-packs of {{Tooltip|Coke}} placed in shared refrigerators vanished within 72 hours, but plates holding six one-dollar bills sat untouched for the same period—a quiet contrast between taking “a thing” and taking money. A cafeteria experiment then paid students 50 cents per correct answer on a 20-problem math task: the control group, who couldn’t cheat, averaged 3.5; a group that shredded worksheets before reporting averaged 6.2; and a third group paid in tokens redeemable for cash 12 feet away claimed 9.4. “Total cheating” was rare in the money conditions but surged with tokens (24 of 150 participants claimed perfect scores), showing how a symbolic medium loosens restraints. Field evidence rhymed with the lab: from wardrobe “returns” to padded expense reports sent through assistants, one or more steps away from cash invites elastic justifications. Tokens, credit, points, and perks add psychological distance, loosen restraints, and expand self-serving rationalizations; bringing transactions closer to cash shrinks dishonesty. ''And that's my point: cheating is a lot easier when it's a step removed from money.''
🍺 At the {{Tooltip|Carolina Brewery}} on {{Tooltip|Franklin Street}} in {{Tooltip|Chapel Hill}}, experimenters in aprons offered two-ounce samples of four house beers—{{Tooltip|Copperline Amber Ale}}, {{Tooltip|Franklin Street Lager}}, {{Tooltip|India Pale Ale}}, and Summer Wheat Ale—and recorded orders and satisfaction. With public, sequential ordering, later patrons tended to avoid duplicating others’ choices and ended up less happy with their beers; the first to order was as satisfied as those in a private-ordering condition, where choices were written down silently. Running the study at roughly a hundred tables and then switching to private ballots for another fifty showed the same pattern; in {{Tooltip|Hong Kong}}, group ordering pushed toward conformity rather than uniqueness, but public choices still reduced satisfaction. Policy “free lunches” such as {{Tooltip|Thaler and Benartzi’s Save More Tomorrow plan}} tied future raises to automatic savings and lifted contribution rates from about 3.5% to around 13.5% over a few years. Social context and self-presentation distort everyday choices, but small design tweaks—defaults, precommitment, privacy—can unlock better outcomes without obvious trade-offs. If errors are systematic, fixes can be systematic too. ''Our irrational behaviors are neither random nor senseless—they are systematic and predictable.''
▲''
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== Background & reception ==
🖋️ '''Author & writing'''. Ariely is a James B. Duke Professor at {{Tooltip|Duke University’s Fuqua School of Business}} and a founding member of the {{Tooltip|Center for Advanced Hindsight}}, grounding the book in an academic program of behavioral research.<ref name="DukeFuqua">{{cite web |title=Dan Ariely |url=https://www.fuqua.duke.edu/faculty/dan-ariely |website=Duke's Fuqua School of Business |publisher=Duke University |access-date=8 November 2025}}</ref> He traces his motivation to months of recovery from severe burn injuries, where painful daily treatments sparked a career-long focus on how people experience pain and make choices under stress.<ref name="AboutDan">{{cite web |title=About Dan |url=https://danariely.com/all-about-dan/ |website=Dan Ariely |publisher=Dan Ariely |access-date=8 November 2025}}</ref> The book adopts plain language by design and uses personal anecdotes to translate experiments for non-specialists.<ref name="AboutDan" /> Many chapters pivot on concrete demonstrations—anchoring with arbitrary numbers, “free” vs. priced options, and expectation effects—before generalizing to everyday decisions.<ref name="NewYorker2008" /> The first edition was published by {{Tooltip|Harper}} in 2008 as a 280-page hardcover.<ref name="OCLC182521026" /> A revised and expanded edition followed in 2010.<ref name="HC2010" />
📈 '''Commercial reception'''. Ariely’s official site describes the book as a {{Tooltip|New York Times}} bestseller, positioning it among the decade’s mainstream behavioral-science hits.<ref name="PIsite" /> {{Tooltip|HarperCollins}} released a revised and expanded edition on 27 April 2010, signaling sustained demand.<ref name="HC2010" /> The official page also lists numerous international editions across Europe, Asia, and Latin America, indicating broad translation and rights activity.<ref name="PIsite" />▼
👍 '''Praise'''. *{{Tooltip|The New Yorker}}* highlighted the book as “a taxonomy of financial folly,” praising memorable experiments that make biases tangible (anchoring and the endowment effect among them).<ref name="NewYorker2008" /> *{{Tooltip|Publishers Weekly}}* noted the engaging blend of psychology and economics and cited accessible examples such as placebo and price effects.<ref name="PW2008" /> In the *{{Tooltip|San Francisco Chronicle}}* ({{Tooltip|SFGate}}), William S. Kowinski called several experiments “eye-opening” and found the conversational style well-suited to a wide readership.<ref name="SFGate2008">{{cite news |title=Economist finds we're 'Predictably Irrational' |url=https://www.sfgate.com/books/article/Economist-finds-we-re-Predictably-Irrational-3288161.php |work=SFGate |date=13 April 2008 |access-date=8 November 2025 |last=Kowinski |first=William S.}}</ref> {{Tooltip|NPR}} coverage likewise emphasized how the book explains invisible forces—emotions, expectations, social norms—that systematically shape everyday choices.<ref name="NPR2008">{{cite news |title=Dissecting People's 'Predictably Irrational' Behavior |url=https://www.wlrn.org/npr-breaking-news/2008-02-21/dissecting-peoples-predictably-irrational-behavior |work=WLRN (NPR) |date=21 February 2008 |access-date=8 November 2025}}</ref>▼
▲📈 '''Commercial reception'''. Ariely’s official site describes the book as a New York Times bestseller, positioning it among the decade’s mainstream behavioral-science hits.<ref name="PIsite" /> HarperCollins released a revised and expanded edition on 27 April 2010, signaling sustained demand.<ref name="HC2010" /> The official page also lists numerous international editions across Europe, Asia, and Latin America, indicating broad translation and rights activity.<ref name="PIsite" />
👎 '''Criticism'''. *{{Tooltip|The Economist}}*’s Free Exchange blog found the book “frustrating,” questioning some interpretations of laboratory results.<ref name="Economist2008">{{cite news |title=Unexpectedly inane |url=https://www.economist.com/free-exchange/2008/02/21/unexpectedly-inane |work=The Economist |date=21 February 2008 |access-date=8 November 2025}}</ref> {{Tooltip|Columbia University’s Statistical Modeling blog}} argued that labeling the allure of “free” as irrational can be overstated and cautioned about over-generalizing from student samples.<ref name="StatModeling2008">{{cite web |title=Book review: Predictably Irrational |url=https://statmodeling.stat.columbia.edu/2008/03/31/book_review_pre/ |website=Statistical Modeling, Causal Inference, and Social Science |publisher=Columbia University |date=31 March 2008 |access-date=8 November 2025}}</ref> {{Tooltip|SFGate}} similarly warned that many demonstrations rely on university participants and may not capture broader populations, even while finding the core message useful.<ref name="SFGate2008" /> Separately, later scrutiny of some Ariely co-authored studies on dishonesty led to a 2021 retraction; a 2024 report, as described by Ariely, said falsified data had been used but found no evidence he knowingly used fake data, a controversy that has colored discussion of his popular works.<ref name="NewYorker2023">{{cite news |title=They Studied Dishonesty. Was Their Work a Lie? |url=https://www.newyorker.com/magazine/2023/10/09/they-studied-dishonesty-was-their-work-a-lie |work=The New Yorker |date=30 September 2023 |access-date=8 November 2025 |last=Lewis-Kraus |first=Gideon}}</ref><ref name="BI2024">{{cite news |title=Dan Ariely Says His Fraud Investigation Is Over. Now What? |url=https://www.businessinsider.com/dan-ariely-duke-fraud-investigation-2024-2 |work=Business Insider |date=22 February 2024 |access-date=8 November 2025 |last=Hamilton |first=Isobel}}</ref>▼
▲👍 '''Praise'''. *The New Yorker* highlighted the book as “a taxonomy of financial folly,” praising memorable experiments that make biases tangible (anchoring and the endowment effect among them).<ref name="NewYorker2008" /> *Publishers Weekly* noted the engaging blend of psychology and economics and cited accessible examples such as placebo and price effects.<ref name="PW2008" /> In the *San Francisco Chronicle* (SFGate), William S. Kowinski called several experiments “eye-opening” and found the conversational style well-suited to a wide readership.<ref name="SFGate2008">{{cite news |title=Economist finds we're 'Predictably Irrational' |url=https://www.sfgate.com/books/article/Economist-finds-we-re-Predictably-Irrational-3288161.php |work=SFGate |date=13 April 2008 |access-date=8 November 2025 |last=Kowinski |first=William S.}}</ref> NPR coverage likewise emphasized how the book explains invisible forces—emotions, expectations, social norms—that systematically shape everyday choices.<ref name="NPR2008">{{cite news |title=Dissecting People's 'Predictably Irrational' Behavior |url=https://www.wlrn.org/npr-breaking-news/2008-02-21/dissecting-peoples-predictably-irrational-behavior |work=WLRN (NPR) |date=21 February 2008 |access-date=8 November 2025}}</ref>
🌍 '''Impact & adoption'''. The book’s concepts have been taught widely: recent university syllabi in behavioral economics at {{Tooltip|UC Davis}} and {{Tooltip|MIT}} assign or recommend *{{Tooltip|Predictably Irrational}}* alongside canonical texts.<ref name="UCDavis2024">{{cite web |title=Introduction to Behavioral Economics — Spring 2024 Syllabus |url=https://kiesel.ucdavis.edu/BehEcon_syllabus_spring2024.pdf |website=UC Davis |publisher=University of California, Davis |date=1 April 2024 |access-date=8 November 2025}}</ref><ref name="MIT1413">{{cite web |title=14.13 Psychology and Economics — Spring 2022 Syllabus |url=https://economics.mit.edu/sites/default/files/inline-files/14.13%20Syllabus%20Spring%202022.pdf |website=MIT Economics |publisher=Massachusetts Institute of Technology |date=2022 |access-date=8 November 2025}}</ref> Media interest has remained high: {{Tooltip|NPR}} covered the book’s release in 2008,<ref name="NPR2008" /> and
▲👎 '''Criticism'''. *The Economist*’s Free Exchange blog found the book “frustrating,” questioning some interpretations of laboratory results.<ref name="Economist2008">{{cite news |title=Unexpectedly inane |url=https://www.economist.com/free-exchange/2008/02/21/unexpectedly-inane |work=The Economist |date=21 February 2008 |access-date=8 November 2025}}</ref> Columbia University’s Statistical Modeling blog argued that labeling the allure of “free” as irrational can be overstated and cautioned about over-generalizing from student samples.<ref name="StatModeling2008">{{cite web |title=Book review: Predictably Irrational |url=https://statmodeling.stat.columbia.edu/2008/03/31/book_review_pre/ |website=Statistical Modeling, Causal Inference, and Social Science |publisher=Columbia University |date=31 March 2008 |access-date=8 November 2025}}</ref> SFGate similarly warned that many demonstrations rely on university participants and may not capture broader populations, even while finding the core message useful.<ref name="SFGate2008" /> Separately, later scrutiny of some Ariely co-authored studies on dishonesty led to a 2021 retraction; a 2024 report, as described by Ariely, said falsified data had been used but found no evidence he knowingly used fake data, a controversy that has colored discussion of his popular works.<ref name="NewYorker2023">{{cite news |title=They Studied Dishonesty. Was Their Work a Lie? |url=https://www.newyorker.com/magazine/2023/10/09/they-studied-dishonesty-was-their-work-a-lie |work=The New Yorker |date=30 September 2023 |access-date=8 November 2025 |last=Lewis-Kraus |first=Gideon}}</ref><ref name="BI2024">{{cite news |title=Dan Ariely Says His Fraud Investigation Is Over. Now What? |url=https://www.businessinsider.com/dan-ariely-duke-fraud-investigation-2024-2 |work=Business Insider |date=22 February 2024 |access-date=8 November 2025 |last=Hamilton |first=Isobel}}</ref>
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▲🌍 '''Impact & adoption'''. The book’s concepts have been taught widely: recent university syllabi in behavioral economics at UC Davis and MIT assign or recommend *Predictably Irrational* alongside canonical texts.<ref name="UCDavis2024">{{cite web |title=Introduction to Behavioral Economics — Spring 2024 Syllabus |url=https://kiesel.ucdavis.edu/BehEcon_syllabus_spring2024.pdf |website=UC Davis |publisher=University of California, Davis |date=1 April 2024 |access-date=8 November 2025}}</ref><ref name="MIT1413">{{cite web |title=14.13 Psychology and Economics — Spring 2022 Syllabus |url=https://economics.mit.edu/sites/default/files/inline-files/14.13%20Syllabus%20Spring%202022.pdf |website=MIT Economics |publisher=Massachusetts Institute of Technology |date=2022 |access-date=8 November 2025}}</ref> Media interest has remained high: NPR covered the book’s release in 2008,<ref name="NPR2008" /> and NBC’s *The Irrational* (premiered 25 September 2023) brought Ariely-style cases to prime-time audiences.<ref name="Deadline2021" />
== See also ==
{{Youtube thumbnail | VZv--sm9XXU | Dan Ariely at Google – ''Predictably Irrational'' talk
▲{{Youtube thumbnail | 9X68dm92HVI | Dan Ariely – Are we in control of our decisions? (17 min)}}
▲{{Youtube thumbnail | VZv--sm9XXU | Dan Ariely at Google – Predictably Irrational talk (60 min)}}
{{Thinking, Fast and Slow/thumbnail}}
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== References ==
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