To determine the traders' prenatal testosterone exposure, the researchers measured their "2D:4D ratio," which is the relative lengths of the index and ring fingers on the right hand. Those exposed to higher levels of testosterone in the womb tend to have relatively longer ring fingers.
SOURCE: Proceedings of the National Academy of Sciences | The Washington Post - January 13, 2009
Born to Be a Trader? Fingers Point to Yes. Article | In addition to subprime mortgages, credit default swaps and lax government oversight, another factor may need to be added to the list of culprits responsible for the economic meltdown: testosterone.