Since the 1970s wage inequality has been growing in the United States, yet another measure of inequality, the difference between women's and men's mean wages, has been declining. Some argue that the gender wage gap would have decreased even more, had overall wage inequality not grown. According to these researchers, the increasing dispersion of wages pushed women's mean wage further away from men's, so women had to swim upstream to reduce the gender wage gap. This reasoning makes intuitive sense: as wage inequality increases, the disadvantage of those who earn below the average wage worsens, and the gain of those who earn above the average increases. Given that the proportion of women who earn below the overall mean wage is greater than tha...