Excessive confidence in one's own answers or judgments. Certainty without accuracy.
Causes poor decision-making, explains why experts are often wrong with great confidence, and drives financial bubbles.
The more information people have, the more overconfident they become, even when the extra information is irrelevant or misleading.
"Good news: You're not as unique as you think. Bad news: You're not as rational as you think either."
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