"Rule" #4: Men Find an Extra 10 percent
Study upon study upon study has shown that women are less comfortable taking risks with their money than men are. One research paper estimated that 10 percent of the difference between men's and women's individual retirement account balances was due to the differences in how the genders approach risk. Once women have educated themselves and feel more confident, they do make more money from their stock investments. And a 2011 study by Barclays Capital and Ledbury Research found that women investors tended to out-earn their male counterparts in the market, largely because they took fewer big risks after investing.