The fertility crash comes down to what men are doing—or not doing—Nobel laureate says

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• Countries with low fertility exhibit a key difference from those with even lower birth rates, according to Nobel Prize–winning economist Claudia Goldin, who pointed to the extra hours women spend on child-rearing and household chores compared with men.

Falling fertility rates around the world have alarmed governments, tech execs like Elon Musk, and economists.