Law of the Jungle

Studies have shown that on average, men are more likely than women to take risks, and the researchers theorized that these differences could be explained by the role of testosterone.
A recent study also showed that stock market traders made more money on days when their testosterone levels were highest.
The new study, detailed online in the journal Evolution and Human Behavior, is the first study to directly examine the relationship between testosterone and financial risk-taking, the researchers say.
The research showed that men whose testosterone levels were greater than the average, beyond normal variation, invested 12 percent more in the risky investment than the average-testosterone participants. The researchers also scored players on facial masculinity. Those who had the manliest faces invested 6 percent more than their average-face counterparts.
The findings may help to explain the biological foundation of why some people are more inclined toward risk-taking than others. Perhaps the wheelers and dealers on Wall Street are just playing their parts in the game of evolution.