Sexist men it appears can earn more than their more enlightened counterparts according to a US study published in the Journal of Applied Psychology.
The study kicked off in the late 70s(!) and asked a large sample whether they believed a woman's place was in the home, or whether the employment of women was likely to lead to higher rates of juvenile delinquency. The same group has been questioned again
periodically since then.
Interestingly there was a correlation between men's salaries and how "old fashioned" they were - roughly an extra $8,500 a year.
Meanwhile women who held the opposite view earned on average $1,500 more than women with "traditional" views.
More on the BBC where there are a couple of theories to explain the results.