This story was originally published by Knowable Magazine.

Back in the 1990s, when U.S. banks started installing automated teller machines in a big way, the human tellers who worked in those banks seemed to be facing rapid obsolescence. If machines could hand out cash and accept deposits on their own, around the clock, who needed people?

The banks did, actually. It’s true that the ATMs made it possible to operate branch banks with many fewer employees: 13 on average, down from 20. But the cost savings just encouraged the parent banks to open so many new branches that the total employment of tellers actually went up.

You can find similar stories in fields like finance, healthcare, education, and law, says James Bessen, the Boston University economist who called his colleagues’ attention to the ATM story in 2015. “The argument isn’t that automation always increases jobs,” he says, “but that it can and often does.”

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