The Number of the Day: 4%
According to a statistic cited in the book The Psychopath Test: A Journey Through the Madness Industry, approximately 4% of business leaders fit the definition of a psychopath. As a comparison, about 1% of the population at large fit those criteria.
Related Fact: The most common tool used for diagnosing someone as a psychopath is the Psychopathy Checklist-Revised (PCL-R) developed by Robert D. Hare. In the episode of This American Life linked below, the show’s host and staff take their turn completing the questionnaire.