The (Honest) Truth About Dishonesty

Dan Ariely, a behavioral economist, examines why people cheat and what forces shape dishonest behavior. Drawing on years of experiments, he argues that dishonesty is not driven by rational cost-benefit calculations but by psychological forces that allow people to cheat in small amounts while still seeing themselves as fundamentally honest.

Ariely's interest in dishonesty began after meeting John Perry Barlow, a consultant for Enron, the energy company whose massive accounting fraud had recently been exposed. Barlow described not deliberate corruption but wishful blindness, an inability to see warning signs despite proximity to the fraud. This encounter led Ariely to question whether dishonesty extends far beyond a few bad actors. He introduces the prevailing economic theory of cheating: the Simple Model of Rational Crime (SMORC), proposed by economist Gary Becker. According to this model, people decide whether to cheat by rationally weighing potential gains against the probability and severity of punishment. If the SMORC were correct, society could reduce dishonesty simply through greater surveillance and harsher penalties.

To test the SMORC, Ariely and his colleagues developed the "matrix task," the book's central experimental tool. Participants are given five minutes to find pairs of numbers that add up to ten within a set of twenty matrices, earning money for each correct answer. In a control condition, an experimenter checks their work; in a "shredder condition," participants destroy their worksheets and self-report their scores. Participants in the shredder condition claim to solve about two more matrices on average, indicating widespread but modest cheating. When the payment per correct answer varies from 25 cents to $10, cheating levels remain constant, and when the probability of getting caught varies, cheating stays the same. These findings contradict the SMORC. Field experiments reinforce this conclusion: In Israel, market vendors selected higher-quality tomatoes for a blind customer, and cab drivers turned off their meters early to give the blind customer a cheaper fare, sacrificing their own income.

Ariely proposes an alternative he calls the "fudge factor theory." People are torn between wanting to benefit from cheating and wanting to maintain a positive self-image. Cognitive flexibility allows people to cheat by small amounts while rationalizing their behavior. The rest of the book explores forces that expand or shrink this fudge factor.

One key factor is psychological distance from money. Ariely placed six-packs of Coca-Cola and plates of dollar bills in MIT dorm refrigerators. The Cokes vanished within days; the cash was untouched. In a formal experiment, participants paid in plastic tokens cheated about twice as much as those paid directly in money. Ariely warns that an increasingly cashless society may further erode moral restraints by distancing people from the reality of money.

Moral reminders prove surprisingly effective. Participants asked to recall the Ten Commandments before the matrix task showed no cheating at all, even though none could remember all ten. Self-declared atheists who swore on a Bible also did not cheat. Signing an honor code before the task eliminated cheating at universities both with and without formal honor codes. Moving a signature line from the bottom to the top of forms reduced dishonesty on tax-like reporting tasks and insurance mileage forms. However, these reminders must be administered at the moment of temptation; existing honor code training and ethics courses show limited long-term effect.

Conflicts of interest distort professional judgment even among well-meaning individuals. Ariely describes a dentist who purchased expensive CAD/CAM (computer-aided design and manufacturing) equipment and began unconsciously recommending unnecessary procedures to recoup the investment. Pharmaceutical representatives exploit similar dynamics through gifts and paying doctors to lecture about drugs, which causes the lecturers to believe their own promotional claims through cognitive dissonance. Disclosure, often proposed as a remedy, can worsen the problem: In one experiment, advisers who disclosed their biased incentives inflated their estimates even further, while recipients of their advice failed to discount sufficiently.

Ego depletion, a concept coined by psychologist Roy Baumeister, also increases dishonesty. Willpower functions like a muscle that weakens with repeated use. Participants whose willpower was depleted through cognitively demanding tasks cheated significantly more on the matrix task. Research on Israeli parole boards similarly shows that judges grant parole more frequently early in the morning and just after lunch, when they are most refreshed.

Wearing counterfeit products increases dishonesty through negative self-signaling. In experiments using real Chloé sunglasses, participants told their glasses were fake cheated far more (74 percent overclaimed) than those told theirs were authentic (30 percent). Over time, those wearing fakes shifted from occasional cheating to cheating at every opportunity, illustrating what Ariely calls the "what-the-hell effect": Once people violate their own standards, they abandon further attempts at self-control. Self-deception compounds these effects, as cheaters quickly come to believe their inflated performance reflects genuine ability. In experiments where participants took quizzes with answer keys visible, those who cheated predicted high scores on future tests even when offered money for accurate self-predictions.

Creativity enables dishonesty by helping people construct more elaborate justifications. Participants who scored higher on creativity measures cheated more, particularly in ambiguous situations; intelligence showed no correlation. At a large advertising agency, employees in departments requiring more creativity scored higher on measures of moral flexibility than those in less creative roles such as accounting.

Dishonesty is also socially contagious. In experiments at Carnegie Mellon University, when a hired actor stood up early in the matrix task, claimed to have solved all twenty matrices, and walked out with all the money, other participants' cheating increased dramatically. However, when the actor wore a University of Pittsburgh sweatshirt signaling membership in a rival school, Carnegie Mellon participants cheated less, wanting to distance themselves from that behavior. Ariely argues that when prominent in-group members cheat, their behavior gradually redefines acceptable norms across organizations and institutions.

Collaborative environments can also increase dishonesty. When participants shared earnings with partners, they cheated more than those cheating only for themselves. Direct monitoring eliminated cheating, but once participants socialized with their monitors beforehand, cheating returned and exceeded individual levels, indicating that altruistic cheating overpowers the supervisory effect once social bonds form. An analysis of millions of dental procedures over twelve years showed that dentists increasingly recommend expensive white fillings over functionally superior silver ones the longer they treat a patient, suggesting that long-term relationships can exacerbate conflicts of interest.

Ariely concludes on a semioptimistic note. Cross-cultural experiments found no significant differences in cheating levels among participants in six countries, suggesting a universal capacity for moral flexibility. While dishonesty is pervasive, people cheat far less than the SMORC predicts, passing up the vast majority of daily opportunities for consequence-free cheating. However, the collective cost of many people cheating a little far exceeds the damage done by a few aggressive cheaters. Ariely recommends moral reminders at the point of temptation, regulation of conflicts of interest, attention to the effects of depletion, and applying the logic of the Broken Windows Theory (fixing small infractions immediately to prevent escalation). He also highlights resetting rituals, both religious (confession, Yom Kippur) and secular (New Year's resolutions), as mechanisms for halting moral deterioration and reversing the what-the-hell effect. Once we understand the irrational forces that drive dishonesty, Ariely argues, we can restructure environments and institutions to promote more honest behavior.