If you divide workers into four groups — men with traditional attitudes, men with egalitarian attitudes, women with traditional attitudes and women with egalitarian attitudes — men with traditional attitudes earn far more for the same work than those in any of the other groups. There are small disparities among the three disadvantaged groups, but the bulk of the income inequality is between the first group and the rest.

And, yes, the study did the basics “The comparisons were based on men and women working in the same kinds of jobs with the same levels of education and putting in the same number of hours per week.”