Contents
Definition
Regret aversion is the behavioral bias whereby individuals modify their decisions to minimize anticipated regret — the negative emotion arising from recognizing that a different decision would have produced a better outcome. The formal economic treatment was introduced by David Bell in his 1982 paper "Regret in Decision Making under Uncertainty" (Operations Research, 30(5), 961–981), which demonstrated that regret is an independent utility argument beyond wealth outcomes. Loomes and Sugden independently proposed "Regret Theory" the same year (Economic Journal, 92(365), 805–824), showing it could explain Allais paradox violations of Expected Utility Theory. In practice, regret aversion takes two primary forms: (a) action regret — regretting a decision you actively made; and (b) inaction regret — regretting not acting. Research consistently shows action regret is felt more acutely in the short term, causing people to avoid making active portfolio changes (holding cash "on the sidelines"), but inaction regret dominates in the long run.
How it manifests in Indian retail investing
Regret aversion explains a cluster of behaviors that puzzles financial planners. First, cash parking: investors who exit equities at the start of a correction sit in savings accounts or liquid funds for 12–24 months, fearing the regret of re-entering just before another fall. The longer they wait, the more the "I missed the recovery" inaction regret accumulates but remains abstract, while the action regret of "buying at the wrong moment" feels vivid. Second, conformity hedging: retail investors in India systematically overweight Nifty 50 / large-cap index components relative to their stated risk profile because deviating from the "obvious" choice creates potential for action regret ("I should have just bought Nifty"). Third, SIP over lumpsum preference in India has a regret-aversion component: SIP spreads the entry point, reducing maximum regret at any single purchase date even when lumpsum is mathematically equivalent or superior in a rising market.
What the data shows
Gilovich and Medvec (1995, "The Experience of Regret: What, When, and Why," Psychological Review, 102(2), 379–395) documented that in surveys of life decisions, action regret dominates in the short term (1 week) but inaction regret dominates over long time horizons (years to decades). Translated to investing: the regret of a bad trade peaks quickly and fades, but the regret of never investing in equities compounds as portfolio shortfall grows. SEBI's 2024 investor survey found that 44% of non-equity-invested households cited "fear of losing money" as the primary reason — consistent with action-regret aversion preventing initial equity entry. AMFI SIP data shows that SIP amounts increase by an average of only 3.2% per year against average wage inflation of 8–10%, suggesting investors under-step-up due to regret aversion about committing more capital.
Worked example
In April 2023, an investor accumulates ₹10 lakh in a liquid fund after redeeming equity MFs during a volatile Q1. The Nifty 50 subsequently rises 18% between April and December 2023. The investor tracks the rally but defers re-entry each month, fearing that entry "now" will precede a correction, generating action regret. By December 2023, the investor has missed ₹1.8 lakh in notional return. The opportunity cost is clear in hindsight, but each month's deferral felt rational because the specific action of investing on that particular date carried concrete regret risk. The regret-aversion trap compounds: the longer the investor waits, the harder it becomes to enter ("I should have entered 6 months ago"), and inaction becomes self-reinforcing. This pattern is economically identical to a 100% cash allocation driven by bias rather than strategy.
How to recognise it in yourself
Regret aversion diagnostics: (1) Has a cash or liquid fund position been held beyond its originally intended duration because "the market might still fall"? (2) Are portfolio changes being delayed because of a specific fear about timing rather than a substantive change in the investment rationale? (3) Is there a pattern of holding positions identical to a benchmark (Nifty 50 index / large-cap category) specifically to avoid the regret of underperforming the "obvious" choice? (4) Does the prospect of making a change and being wrong feel worse than the prospect of doing nothing and missing a return? The distinction between (3) and (4) helps separate regret aversion (emotion-driven) from genuine risk management (analysis-driven).
See also
Primary sources
- Bell, D.E. (1982). Regret in Decision Making under Uncertainty. Operations Research, 30(5), 961–981.
- Loomes, G. & Sugden, R. (1982). Regret Theory: An Alternative Theory of Rational Choice under Uncertainty. Economic Journal, 92(365), 805–824.
- Gilovich, T. & Medvec, V.H. (1995). The Experience of Regret. Psychological Review, 102(2), 379–395.
MintByte (ARN-314872 / APMI APRN-01658) is a SEBI-registered MFD and GIFT City wealth management firm. This glossary entry is educational and does not constitute investment advice.