SIGMUND FREUD, the father of psychoanalysis, is said to have been asked what he thought a normal person should be able to do well. His response reportedly was “Lieben und arbeiten”—to love and to work. The link between the two—or rather, between marriage and jobs—has long been studied by researchers, who have examined everything from marriage rates during steel-manufacturing booms and busts to the percentage of children born out of wedlock in places that had lost jobs because of the flood of cheap imports from China. They found the same thing: the availability of well-paid jobs boosted the
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