Stephen J. Dubner is the co-author, with Steven D. Levitt, of Freakonomics. Their latest book, When to Rob a Bank, came out last week.

“I’ve abandoned more books than I’ve written, which I’m happy about. I’m very pro-quitting. We get preached this idea that if you quit something, if you don’t see something through to completion then you’re a loser, you’re a failure. I just think that’s a crazy way to look at things. But it’s also easy to overlook opportunity costs. Like, what could I be doing instead?”

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