Researchers propose overconfidence may signal high skill

A new theory published in Psychological Review suggests that overconfidence may serve as a signal of actual competence rather than a lack of ability. Researchers Chris Dawson of the University of Bath and David de Meza of the London School of Economics and Political Science argue that overconfidence and loss aversion may have evolved as a matched pair of traits.

Using a mathematical model based on data from approximately 4,000 test-takers, the study proposes that while overconfidence carries a cost—such as poor decision-making or excessive risk-taking—this cost is significantly lower for highly skilled individuals who can recover quickly from errors. In contrast, the cost of such errors is much higher for those with mediocre abilities.

The researchers also challenge the traditional Dunning-Kruger effect, which posits that the least skilled individuals are the most overconfident. De Meza suggests that the classic Dunning-Kruger pattern may be a statistical illusion caused by the inclusion of luck in test scores, which can manufacture a false psychological phenomenon when participants are sorted purely by score.