we're back with nick kristoff, sheryl wudunn and zainab salbi.k, when you look at the statistic, why do you think that's true? >> that's the part that we really don't know. some people think it's nurturing instinct. other people tend to think it's the way we're socialized. what is true across traditions women are more likely to take income they have and also if they have titled-over assets. if they have financial assets, more likely to convert those to the benefit of their children and to invest in small businesses. >> have you seen this in action? are there there stories where you actually can see this vividly? >> there many different ways that this surfaces. micro finance, a typical way that many people have gotten involved in this issue, if you give a loan to a woman she really tends to take it far. when you give a loan to a man, he can take it somewhere, but often the repayment rates are much lower. big micro financing institutions like rah mean and brack which basically started these things in bangladesh, they didn't want to be discriminator