This is the terrain Liza Mundy strides into in her ambitious new book, “The Richer Sex.” Mundy predicts that women’s economic rise above men, which she calls “The Big Flip” — one of several cutesy terms she uses, along with “bread­women,” her word for female breadwinners — will benefit everyone. “Women’s earnings will bring about a new liberation for women but also for men,” she writes. “More women will marry down; more men will marry up.”

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