So where does all this overconfidence come from? An obvious factor is personality type. In work on overclaiming, people who score high on narcissism are far more likely to be know-it-alls. And as we’ve seen already, gender also has an impact. Whether it’s fighting a bear or winning a point off Serena Williams, on average men are more likely to display overconfidence. Of course, men do tend to be physically stronger than women, so perhaps we’d expect to see this pattern with these types of question, but when it comes to landing a plane, men were also more confident than women.
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