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In economics, a market is a place (even virtual) where buyers and sellers meet to exchange goods or services. Economists love markets. It's like all of our supply and demand graphs have come to life. Almost everything you buy goes through some sort of marketplace—your cup of coffee came from trading in the bean markets. Your spouse might have come from the dating marketplace on the apps. Even kids will tell you one Snickers is worth at least two Twix.

But sometimes, as we'll see today, markets can go terribly wrong; greed can run out of control; lives can be at risk. That's when the government often steps in and gives the market a little nudge to work better. Today's episode: Market Design.

The series is hosted by Robert Smith and produced by Eric Mennel. Our project manager is Devin Mellor. This episode was edited by Planet Money Executive Producer Alex Goldmark and fact-checked by Emily Crawford.

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