People tend to think about trade as if it's competition between companies - if Apple wins, Google loses. But that's false. Trade makes nations better off in general. Now, I want to be clear. I'm not saying that everything about trade is good and beneficial. Trade also has costs.

There's always new work to do. Adjusting to the rapid pace of technological change creates real challenges, seen most clearly in our polarized labor market and the threat that it poses to economic mobility. Rising to this challenge is not automatic. It's not costless. It's not easy. But it is feasible.

Here's a startling fact: in the 45 years since the introduction of the automated teller machine, those vending machines that dispense cash, the number of human bank tellers employed in the United States has roughly doubled, from about a quarter of a million to a half a million.

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