 However, much of this can be attributed to employment rates.The employment rate of women in their 30s has increased from 39% in 1964 to 70% in 2004; whereas, the rate of employment for men in this same age group has decreased from 91% in 1964 to 86% in 2004.This sharp increase in income for working women, in addition to stable male salaries, is the reason upward economic mobility is attributed to women.