I heard this spot from NPR yesterday on why men are more likely to be entrepreneurs than men.
Analysis finds women are less likely to be arrogant about mistakes and more likely to be humble about their achievements. Men are more likely to disregard market signals that their ideas are flawed.
Source: Why Are Women Less Likely To Become Entrepreneurs Than Men? : NPR
This surprised me. The conclusion seemed to say guys who are too arrogant to realize they made a mistake are the entrepreneurs that are most likely to succeed.