Popularized by movies about morally bankrupt men on Wall Street, the myth of the psychopathic stockbroker who is able to succeed financially despite his character flaws has gone mainstream. Yes, they think greed is good. Yes, these power-hungry bullies are not role models for society. But, hey, at least they’re charming, persuasive risk-takers and good with numbers, the thinking goes.

Contrary to those stereotypes, a new paper in Personality and Social Psychology Bulletin found that hedge fund managers who showed psychopathic tendencies were actually worse investors for their clients. In the study, researchers characterized psychopathy as people who lack empathy and are impulsive and aggressive.

How to identify a psychopathic manager

But how could the researchers identify who was a psychopathic force of manipulation and deception? Apparently, our body language give us away. Instead of asking managers straight-up about their psychopathic tendencies, the researchers relied on coders rating nonverbal and verbal behaviors of hedge fund managers in semistructured video interviews. The study was building upon previous research that found emotional disturbances in people’s facial expression and language can expose people’s characters.

Under this research, Machiavellian types use behavioral signals like expansive posture to display dominance. Narcissists make conversations all about them and use “I” over “we.” And psychopaths are prone to erratic emotional expression and will smile and take pleasure at the failures of others

In total, the researchers identified the psychopathic, Machiavellian, and narcissistic tendencies — the so-called “Dark Triad” traits — in 101 hedge fund managers. Then, researchers looked to see if that affected their financial performance in 2005-2015, a 10-year period of particular economic volatility.

The psychopath effect

While Machiavellianism had no effect on financial performance, psychopathic tendencies did. Those who showed psychopathic personality traits had annualized returns of nearly 1% less than managers rated at the mean of psychopathy. The more psychopathic Read More Here