Why is it so hard to sell something at a loss, even when you already know it’s the right decision?

The reasoning is clear. The position no longer fits. The original case has changed or quietly faded. And yet, when it comes time to act, something holds you back. It is rarely dramatic. More often, it feels like a quiet resistance. A sense that waiting might be better. That things could turn. That selling now would somehow make the loss more real than it already is.

This is where loss aversion begins to show itself. It is not simply a dislike of losing money. It is the way losses are experienced relative to gains. Psychologically, a loss tends to feel more significant than an equivalent gain feels rewarding. The imbalance is subtle, but it has consequences. Decisions start to tilt, not because the facts have changed, but because the emotional weight attached to them has.

This idea was explored in the late 1970s by Daniel Kahneman and Amos Tversky, who studied how people make decisions under risk. In a series of simple experiments, they found that individuals tend to prefer certainty when dealing with gains, but become more willing to take risks when trying to avoid losses. Faced with a guaranteed loss or a chance to avoid it, many people will choose the gamble, even if it leads to a worse outcome on average. The decision is not driven purely by logic, but by how the outcome is felt.

In markets, this pattern shows up in familiar ways. Positions that are in profit are often closed earlier than planned, securing the gain and removing uncertainty. Positions that are in loss are treated differently. They are given more time, more justification, and more patience than they might otherwise deserve. Over time, this creates an imbalance where small gains are realised, while larger losses are allowed to develop.

Most of this does not feel irrational in the moment. It feels measured. Even responsible. But the pattern becomes clearer when viewed across decisions rather than within them. The hesitation to realise a loss is not just about the investment itself. It is about the experience of accepting it.

And that experience is often what shapes the decision.

For Further Reading

Kahneman, D., & Tversky, A. (1979). Prospect Theory: An Analysis of Decision under Risk. Econometrica, 47(2), 263–291.