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For many American couples, this is not just a thought experiment. Researchers have recently begun scrutinizing a new kind of family ruled by "breadwinner wives" or "top income wives," defined as women who make more money than their husbands. About 22 percent of American marriages of people over 30 fall into this category, up from 4 percent in 1970. (For men without a college degree, the rate is higher: One-quarter are married to wives who earn more than they do.) And demographers expect the number of such marriages to grow, as women continue to get more college degrees than young men and to outearn them, especially early in their careers.

-Slate