Self-Attribution Bias
The tendency to credit successes to one's own skill and failures to external circumstances.
How it is identified
Test: favourable outcomes are attributed internally and unfavourable ones externally, regardless of the actual process quality
Unit
qualitative
In depth
This bias is the engine that converts luck into confidence: a rising market makes almost every position profitable, and attributing that to skill produces larger positions and more leverage just as valuations become less favourable. It breaks the feedback loop that learning requires, because a bad outcome attributed to circumstances teaches nothing about the process that produced it. It is strongest in bull markets and among newer participants who have not yet experienced a full cycle. Separating process quality from outcome, and recording both, is the only practical defence.
Worked example
A portfolio up 45% in a year when the index rose 42% is described as good stock picking. The same investor down 30% when the index fell 28% attributes it to market conditions, and both years were the market.
Illustrative figures, chosen so the arithmetic is easy to follow. Not a live price and not a valuation of any company.
Educational reference only
This entry explains what “Self-Attribution Bias” means. It is not investment advice and not a recommendation to buy or sell any security. Any numbers above are illustrative, not live prices, and nothing here predicts price direction or rates a stock. Consider your own circumstances and consult a SEBI-registered investment adviser before acting.