Regret Aversion
Category: Decision Making
You make the choice that protects you from feeling stupid later, not the choice with the best expected outcome.
How it works
Regret aversion is when you weight the anticipated pain of a bad outcome you caused more heavily than the outcome itself, so you steer toward whatever choice will hurt least to look back on. The key move is counterfactual: you are not just comparing outcomes, you are comparing what happened against the vivid alternative you could have had, and the sting of "I could have done better" gets baked into the decision before you even make it.
This is why doing nothing often feels safer than acting, because inaction produces a hazier, more forgivable counterfactual than a decision you can point to and blame. It also explains why you cling to defaults, follow the crowd, and refuse to sell losers: each of those buys down future self-blame, even when it costs you money or health. Loomes and Sugden showed this is not irrational noise but a stable, predictable pattern that even reverses classic expected-utility preferences.
Where you'll see it
- Terrance Odean tracked 10,000 brokerage accounts (1998) and found investors sold winners far more readily than losers, the disposition effect, because dumping a loser forces you to convert a paper loss into a confirmed mistake. The self-blame is costly: the winners investors sold went on to outperform the losers they held onto by about 3.4 percentage points over the following year.
- Brewer and colleagues meta-analyzed 81 studies covering 45,618 people (2016) and found anticipated regret correlated with health intentions at r = .50 and actual behavior at r = .29. Crucially, people anticipated more regret from NOT vaccinating (inaction) than from vaccinating, which is why 'you'll regret it if you don't' messaging moves vaccination rates.
- The 401(k) default trap: employees stay in whatever fund and contribution rate they were auto-enrolled into for years, because changing it means owning the outcome. If the market drops after you actively rebalance, that is your fault. If you never touched it, the market did it to you.
- Zeelenberg and Pieters showed people pay a premium to avoid feedback about the road not taken. Lottery players stick with their regular numbers not because those numbers are better, but because seeing 'their' numbers win after switching would be unbearable.
Where it comes from
Regret aversion was formalized in 1982, when three researchers independently arrived at the same idea. David E. Bell published "Regret in Decision Making under Uncertainty" in Operations Research, Graham Loomes and Robert Sugden published "Regret Theory: An Alternative Theory of Rational Choice under Uncertainty" in The Economic Journal, and Peter Fishburn developed a parallel formulation the same year. Their shared insight: expected utility theory kept failing to predict real choices because money alone was not a rich enough description of an outcome. People also care about how a result compares to the result they gave up, and they will trade away financial return to avoid the sting of "the other choice would have been better." The idea has deeper roots in Leonard Savage's earlier minimax-regret rule, but the 1982 papers turned it into a testable theory with a regret function that reproduces the same behavioral paradoxes (like the Allais paradox) that broke standard models.
How to counter it
Set the rule before the outcome exists. Decide your exit before you enter: a sell price when you buy, a rebalancing date on the calendar, an "if X then Y" trigger written down. A rule you made in advance cannot be re-read later as a personal blunder, which is exactly the sting that regret aversion is trying to dodge.
Judge the bet, not the result, and say it out loud. Ask "given only what I knew at the time, was this a good call?" and be ready to defend it to a sharp friend using zero hindsight. A smart decision can still blow up and a dumb one can still pay off, so if you only grade yourself on outcomes you will keep steering toward whatever is easiest to explain instead of whatever is best.
Make inaction cost you the same as action. Doing nothing feels forgivable because it leaves a hazy counterfactual, so you will systematically under-act to stay blameless. When you catch yourself saying "I'll just leave it as is to be safe," reframe it: pretend the status quo is a fresh purchase you are making today. If you would not actively buy it now, then staying is a decision too, and a cowardly one.
Name the tell in the moment. The second you hear yourself think "at least this way I can't be blamed," stop and flag it as regret aversion talking, not judgment. That phrase means you are optimizing to protect your future self-image, so deliberately pick the option you would choose if no one, including you, would ever review the choice.
The tell
You catch yourself saying "at least this way I can't be blamed" or "I'll just leave it as is for now," and the option you are drifting toward is the one that is easiest to explain later rather than the one that is actually best.
Related biases
References
- David E. Bell (1982). Regret in Decision Making under Uncertainty. Operations Research, 30(5), 961-981
- Graham Loomes and Robert Sugden (1982). Regret Theory: An Alternative Theory of Rational Choice under Uncertainty. The Economic Journal, 92(368), 805-824
- Terrance Odean (1998). Are Investors Reluctant to Realize Their Losses?. The Journal of Finance, 53(5), 1775-1798
- Noel T. Brewer, Jessica T. DeFrank, and Melissa B. Gilkey (2016). Anticipated Regret and Health Behavior: A Meta-Analysis. Health Psychology, 35(11), 1264-1275
- Marcel Zeelenberg and Rik Pieters (2007). A Theory of Regret Regulation 1.0. Journal of Consumer Psychology, 17(1), 3-18