it is the primary one but it doesn't seem to be taken into consideration at all. why is that? Certainly a better indicator of privilege than sex.

eg: 'Only 3.8 percent of American families make more than $200,000 per year. But at Harvard University, 45.6 percent of incoming freshman come from families making $200,000 or more. A mere 4 percent of Harvard students come from a family in the bottom quintile of US incomes, and only 17.8 percent come from the bottom three quintiles'[1].

1. http://www.aljazeera.com/indepth/opinion/2013/10/immorality-...