Why Investors Keep Getting in Their Own Way

October 22, 2026 - 23:44

Say you buy shares in a company. The price climbs and months later you sell for a healthy profit. Ask why it worked, and the answer is often some version of "I made a good call." Now imagine the trade goes the other way. The stock drops, you sell at a loss, and suddenly the explanation shifts. The market was irrational. The timing was unlucky. A news event spoiled the plan. The decision itself, somehow, was sound.

That gap between how people explain wins and how they explain losses sits at the heart of a wide body of research on investor behavior. Psychologists call it self-serving attribution, and it quietly distorts how people learn from their own track record. If every gain is proof of skill and every loss is bad luck, the lessons that might improve future decisions never get absorbed.

The problem compounds over time. Investors who credit themselves for gains tend to grow overconfident, trading more often and taking bigger risks. Studies of trading records have repeatedly found that the most active accounts often earn less than the ones that sit still, partly because confidence outruns competence.

Other mental shortcuts pile on. Losses hurt roughly twice as much as equivalent gains feel good, which pushes people to hold losing positions too long while selling winners too early. Recency bias leads investors to assume recent market conditions will continue indefinitely. Confirmation bias makes them seek out news that supports what they already believe.

None of this means investors are foolish. These patterns are ordinary features of how human minds process uncertainty. But recognizing them is the first step toward countering them. Keeping a written record of why each decision was made, reviewing outcomes honestly, and sticking to a plan set before emotions take over can all help close the gap between what investors think is happening and what is actually happening.