There's never been a better time to be a worker with special skills or the right education, because these people can use technology to create and capture value.

Economists have understood since the Victorian era that the main benefits of trade come from comparative advantage: the idea that people can specialize in what they're good at and then benefit from exchange. The principle is no more mysterious than specialization in the labor market.

There's a reason I write articles and go out for good dinners: because I'm better at research than cooking. And there are people who are much better at cooking than research, so it's mutually beneficial for us to specialize.

The U.S. tends to export high-tech goods because we have strong comparative advantage there, and we tend to import labor-intensive and less skill-intensive goods that other countries can do more cheaply.

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.

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.