"Despite advances, women still take home 77 cents for each dollar earned annually by men, according to the Institute for Women's Policy Research, a Washington think tank. Advocates believe roughly 40 percent of that gap is based on differences in the types of occupations men and women choose. But they estimate that 25 percent to 40 percent of it is caused by discrimination.
Retail salesmen earn $620 a week on average compared with $466 for their female counterparts, according to the institute's analysis of U.S. Department of Labor Statistics. Male managers earn $1,406 a week on average, compared with $1,047 for women in similar positions."