I think I’ve written about this same study before.

That male chauvinism works to the advantage of men in a male-dominatedmarketplace shouldn’t be surprising. But the magnitude of the effect took the study’s authors by surprise: sexist men earned, on average, $11,930 more per year than their egalitarian male counterparts over a 25-year period.

The effect works in reverse for women. While they still earned slightly less than egalitarian-minded men, women who believed in gender equality earned $1,052 more per year than women who held more “traditional” views.

In the Battle of the Sexes, Partisans Outearn Peacemakers – Freakonomics – Opinion – New York Times Blog.