Psychologycalendar_todayLast updated: Apr 2026
What is Dunning-Kruger Effect?
/ˈdʌnɪŋ ˈkruːɡər ɪˈfɛkt/
The Dunning-Kruger effect is a cognitive bias where people with limited knowledge in a domain overestimate their competence, while true experts often underestimate theirs.
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Everyday Example
A person who has read one book on investing may feel more confident picking stocks than a professional fund manager who knows how much they do not know.
publicReal-World Application
“Surveys show that 93% of US drivers rate themselves as "above average" — a mathematical impossibility that perfectly illustrates the Dunning-Kruger effect.”
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Did you know?
First documented by David Dunning and Justin Kruger at Cornell University in 1999, the paper has become one of the most cited in modern psychology.
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Key Insight
The more you learn about a complex topic, the more aware you become of how much you don't know — expertise breeds humility, not confidence.
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