Example of Overconfidence Bias
- A startup founder confidently projects profitability within the first year and raises capital based on aggressive forecasts, ignoring base rates showing that most startups take much longer or never reach profitability at all.
Overconfidence in personal projections leads to underweighting statistical base rates and historical patterns of failure. - A student finishes an exam feeling certain they scored above 90%, only to receive a 74%, because they mistook familiarity with the material for actual mastery of it.
The feeling of knowing is confused with verified knowledge, inflating perceived performance beyond actual performance.
Note
This is a common biasOverconfidence bias is closely related to the Dunning-Kruger Effect, in which people with limited competence in a domain are especially likely to overestimate their ability, while true experts tend to be slightly more calibrated.
