The Sunk Cost Fallacy: Why You Hold Losing Investments Longer Than You Should
The sunk cost fallacy is responsible for billions in investment losses. It makes investors hold bad positions just because they are already in them — a purely emotional decision dressed up as loyalty.
You bought a mutual fund at ₹25 NAV. It is now at ₹17 NAV. You are down 32%. You review the fund and realise the manager has changed, performance has lagged peers for 4 years, and the category has gone out of favour. A friend recommends switching to a better-performing fund in the same category. Your response: "I can't sell now — I need to wait until it recovers to my buy price."
This is the sunk cost fallacy in operation. The money you have already lost is gone regardless of what you do next. The correct question is: "What is the best place for this money going forward?" But sunk cost thinking asks a different question: "How do I avoid feeling the loss?"
The Psychology Behind It
The sunk cost fallacy is driven by loss aversion (Kahneman) — the pain of realising a loss is felt approximately 2.5x more intensely than the pleasure of an equivalent gain. Selling at a loss crystallises that pain into reality. Holding the losing position keeps it abstract — a number on a screen rather than an acknowledged mistake.
The brain invents justifications: "It will recover." "The market doesn't know what this fund is worth." "I just need to be patient." These rationalisations are retrospective explanations for an emotionally-driven decision to avoid loss recognition.
The Financial Damage
Every month you hold an underperforming investment is a month your capital is not in a better one. If Fund A (which you hold at a loss) returns 6% annually and Fund B (which you should switch to) returns 11% annually, every year of delay costs you 5% on your stuck capital — compounded. The cost of the sunk cost fallacy is not just the existing loss; it is the opportunity cost of the capital being stuck in the wrong place.
The reframe that breaks the fallacy
Ask yourself: "If I had this money in cash today, would I choose to invest it in this specific fund?" If the answer is no — because you would choose something else — then there is no rational reason to hold it just because you happen to be in it already. The cost price is irrelevant to the forward decision. Completely, mathematically irrelevant. The market does not know or care what you paid.
When Holding Is Actually Right
Not every losing investment should be sold. The sunk cost fallacy is the wrong reason to hold — but there are right reasons. If a fund is down because of general market conditions (not fund-specific problems), and its investment process and manager are intact, holding is rational. The test: has anything fundamentally changed about why you originally invested? If not, hold. If yes (manager change, style drift, genuine deterioration), the sunk cost should not be a factor in your decision.
This article is for educational purposes only. It does not constitute investment advice. Mutual fund investments are subject to market risks — please read all scheme-related documents carefully before investing.