Kaihō kōkai

Regret avoidance is a decision-making pattern in which anticipated regret shapes choice before an outcome occurs. Regret itself is both an emotion and a punishment people administer to themselves: it involves the feeling that they should have known better, painful thoughts about the mistake and the opportunities lost, self-reproach, and a wish to undo what happened. Because people can imagine alternatives to reality, the prospect of such an alternative can influence action as powerfully as the expected material result.

Definition and Emotional Mechanism

Regret becomes especially intense when a person can easily imagine having done something else. It is therefore a counterfactual emotion, activated by the availability of alternatives to reality. Unusual events are particularly fertile ground for regret because they are easier to mentally reverse than ordinary ones. After a plane crash, stories often focus on passengers who almost did not board: someone received a last-minute seat, transferred from another airline, or postponed an earlier flight. These details make the fatal choice feel abnormal and make the normal alternative vividly available in imagination.

The same mechanism explains why regret is connected to normality. Memory contains a representation of how events ordinarily proceed; an abnormal action attracts attention and simultaneously calls up the ordinary action that would have occurred under similar circumstances. The more readily the alternative can be pictured, the more forcefully the mind experiences the actual outcome as a mistake. Regret avoidance thus does not require that an alternative really would have produced a better result. It requires only that the alternative be psychologically accessible and that the person feel responsible for departing from it.

Action, Inaction, and the Default

A central asymmetry distinguishes action from inaction. In a comparison involving two investors, Paul and George ended up in objectively identical positions: both owned stock A and both would have been better off by owning stock B. George had sold stock B and bought stock A, whereas Paul had simply failed to sell stock B. Respondents overwhelmingly expected George to feel greater regret, with 92 percent choosing George and only 8 percent choosing Paul. The difference was not the financial outcome but the route taken to reach it.

The underlying distinction is between a default option and an action that departs from the default. When people deviate from the default, they can easily imagine the standard alternative and blame themselves for having left it. The same pattern appears in gambling: people are expected to feel happier when they gamble and win than when they refrain from gambling and receive the same amount, while losses produce an even stronger asymmetry. A choice that departs from the normal course carries a larger anticipated emotional liability.

A blackjack simulation made the power of wording and defaults especially clear. Some players were asked whether they wished to hit, while others were asked whether they wished to stand. Regardless of which question they received, saying yes produced much more regret than saying no when the result was bad. The wording suggested a default response: having no strong wish to do the proposed thing. Regret was generated by departing from that implied default, not simply by the objective consequences of the play.

Conventional Choices and High-Stakes Decisions

Because unusual actions expose decision makers to blame and self-reproach, anticipated regret favors conventional and risk-averse choices. Consumers reminded that their decisions might lead to regret become more likely to choose brand-name products over generics. Financial-fund managers approaching the end of the year tend to remove unconventional or questionable stocks from their portfolios, anticipating later evaluation of decisions that might appear abnormal if they fail.

The bias can become consequential in life-and-death decisions. A physician treating a gravely ill patient may have one treatment that conforms to the normal standard of care and another unusual treatment that might improve the patient’s chances, although the evidence is inconclusive. Prescribing the unconventional treatment exposes the physician to regret, blame, and perhaps litigation if the outcome is bad, because hindsight makes the ordinary treatment easier to imagine as the proper choice. A successful unconventional treatment may enhance the physician’s reputation, but the possible benefit is psychologically smaller than the possible cost: success is generally easier to regard as normal than failure.

Defaults, Choice Architecture, and Policy

The logic of regret avoidance helps explain why defaults are powerful in public policy. Organ-donation rates differed dramatically between culturally similar European countries: donation was close to 100 percent in Austria but only 12 percent in Germany, 86 percent in Sweden but 4 percent in Denmark. The decisive difference was the form. In high-donation countries, people were presumed willing to donate unless they checked an opt-out box; in low-donation countries, they had to check an opt-in box to become donors.

The default effect is not necessarily a deep difference in values. It often reflects the laziness of System 2. People check a box when they have already decided what they want, but an unprepared person must expend effort to determine whether to act. Since deviating from the default requires effort and assumes responsibility, the default becomes the psychologically safer path. The same principle supports automatic enrollment in pension plans: people retain the freedom to opt out, but the ordinary option protects them from the consequences of failing to make a difficult decision.

This application belongs to the broader policy approach advanced by Richard Thaler and Cass Sunstein in Nudge. Their idea of libertarian paternalism allows institutions to structure choices so that people are more likely to serve their long-term interests without removing alternatives. Choice architecture matters because presentation, defaults, and the relative effort required by each option influence behavior. The approach also recognizes that Humans, unlike idealized Econs, may not read complex contracts or process every disclosure carefully; protections therefore need to make important information simple and understandable rather than merely available in fine print.

Reducing Regret Through Better Decisions

The book places regret avoidance within a wider program for improving judgment. Individual intuition is vulnerable to coherent but incomplete stories, and people rarely receive a warning signal when they are entering a cognitive minefield. Organizations can compensate by imposing procedures that slow decisions and distribute responsibility. They can use checklists, reference-class forecasting, and the premortem, in which knowledgeable participants imagine that a plan has been implemented and has ended in disaster, then write a brief history of how the disaster occurred. Such procedures make neglected alternatives and possible failures easier to articulate before commitment, when regret has not yet hardened into blame.

The same institutional logic applies to meetings. Independent judgments should be collected before discussion so that early, assertive speakers do not pull others into agreement and create correlated errors. Multiple sources of information are most valuable when their errors remain independent; witnesses, for example, should not exchange accounts before testifying. These practices do more than improve accuracy. They distribute the burden of choice across a process, making it less likely that a later failure will be attributed to one conspicuous departure from the norm.

Regret avoidance therefore exposes a tension at the heart of decision making. It can protect people from reckless departures and make defaults useful, but it can also suppress experimentation, preserve conventional investments, and discourage an unusual action whose expected benefits exceed its emotional risks. The concept shows why the safest-feeling choice is not always the best one: people are responding not only to outcomes, but also to the future story they expect to tell themselves about having chosen them.