Study finds size matters for financial trading success LONDON (Reuters) â In the testosterone-fuelled world of financial trading, it appears that hormones do rule and size really does matter, British researchers said on Monday. Their study found that experienced traders with the longest ring fingers made more than three times the amount of money as did their less well endowed colleagues. The length of a person's ring finger relative to the index finger may be a measure of prenatal exposure to male sex hormones or androgens, which could boost the concentration and reflexes needed to make trades on sudden notice, they said. http://news.yahoo.com/s/nm/20090114/od_uk_nm/oukoe_uk_finger_success