Loss aversion and sunk cost

Retail investors in India often keep losing stocks for too long and sell winning ones prematurely. This habit is driven by two psychological forces: loss aversion and the sunk‑cost fallacy. Understanding these can help you make calmer, more rational decisions.

Why it matters

When you buy a share or a mutual‑fund unit you feel a sense of ownership. If the price falls, the loss feels personal, even though the money is still yours. Loss aversion makes that pain feel stronger than the equivalent pleasure of a gain. As a result, you hold on to a losing position hoping it will recover, even when the fundamentals have deteriorated.

The sunk‑cost fallacy adds another layer. Money already spent is “sunk” and cannot be recovered. Yet the emotional attachment to that investment can make you think you must keep it alive, as if you have already paid the price. This leads to holding losers and selling winners early, which erodes long‑term returns.

India example

Consider a typical Indian household that invested ₹50,000 in a large‑cap equity mutual fund in 2018. By 2020, the fund’s NAV had fallen 20 % due to a market correction. The family, feeling the loss, decided to keep the units instead of selling them. They believed the market would rebound and that selling would lock in a loss. Meanwhile, the same household had another investment in a technology company that had doubled in value since 2018. When the stock hit ₹1,200, the family sold it at ₹1,000, missing the upside, because they were eager to “take profits” and avoid the fear of missing a potential drop.

In both cases, the emotional response to loss and the desire to avoid “wasting” the initial ₹50,000 drove the decisions, not a rational assessment of future prospects.

Picture

• Hold Loser70
• Sell Winner30

Illustrative only — not live market data.

The chart shows that 70 % of investors tend to hold onto losing positions, while only 30 % sell winners. These numbers are purely illustrative but reflect the common imbalance in decision making.

Exercise

1. List the last five investments you made (stocks, mutual funds, or other assets).
2. For each, note whether you sold because it was a winner or because it was a loser.
3. Write a brief sentence explaining why you made that decision.
4. Review the list and identify any patterns that match loss aversion or sunk‑cost thinking.

Doing this exercise on paper forces you to confront the emotions behind each move.

Failure mode

The most common mistake is to let the fear of loss dictate every trade. You might hold a stock that has fallen 30 % simply because you bought it, hoping it will recover, while you sell a winning stock at the first sign of a dip. This “buy‑and‑hold” mindset for losers and “sell‑and‑panic” for winners is a recipe for underperformance.

Checklist

1. Ask yourself: Is the decision based on future fundamentals or past money spent?
2. Check the trend: Does the asset still align with your long‑term goals?
3. Set a rule: Decide in advance how much loss you are willing to tolerate before cutting losses.

Educational only. Not investment advice or SEBI-registered research.