Maybe the secret to success on Wall Street is being nice. In the world of high finance, it's been an article of faith among some that the only way to succeed - or even survive - is to be ruthless. But a new study in the latest issue of the Personality & Social Psychology Bulletin suggests those money makers at the top of the food chain, hedge fund managers, could benefit from being a little less mean. It turns out that people who exhibit what health professionals consider psychopathic traits actually perform worse than their peers over time.