Episode Details

I’m posting our Wednesday conversation as this week’s video. Transcript below.

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TRANSCRIPT: Paul Krugman in Conversation with Heather Cox Richardson

(recorded 5/20/26)

Heather Cox Richardson: How are you doing, Professor Krugman? I know you’re on vacation.

Paul Krugman: Yeah. As I wrote the other day, I’m in Europe, which means I don’t have to think about Trump 100% of the time, only about 90%. So that’s a little bit of release psychologically.

HCR: It’s really astonishing, isn’t it? But hopefully we don’t talk entirely about him today. I’m actually interested and would love to hear what you have to say about artificial intelligence, not itself as an entity, but as a factor in the economy. Because boy, it sure looks to me like we are way overinvested in AI. I think the growth on the stock market is basically AI companies. We know now that there’s more construction in AI data centers than there is in commercial real estate. And I’m wondering, can we just talk about that and you walk us through what this looks like? Because everybody keeps saying, “Oh, it’s a bubble like the housing bubble or like the dot-com bubble.” And I’m looking at it and saying…

PK: Obviously, history is mostly what we have to go on. There have been many bubbles like this. There’s some broad similarities to dot-com, which was also a telecommunication thing. It also looks like the canal bubble in England, which was earlier. Most of the bubbles were pretty clearly bubbles at the time and that was certainly true for dot-com which I sort of still remember in real time. But with AI, I’m finding that the contrasts with the late 90s bubble are really illuminating. Obviously it’s again technology with lots of investment. There’s an enormous enthusiasm of a kind, but in other ways, it’s quite different.

HCR: Well, let’s start with this. What exactly is a bubble?

PK: Yeah, it’s always a question, but a bubble more or less means that people are investing in something that has no realistic chance of paying off—not socially but just commercially, to an extent that justifies the amount of money being thrown at it. Crucially, a bubble is something that people do because everyone else is doing it. So, Robert Shiller, the great bubble theorist of modern economics, said that a bubble is a natural Ponzi scheme. It’s something where you get in and you make money because other people get in, and people keep on coming in because everybody before them made money. But in the end, it’s a game where the money isn’t really there. It all depends on fresh crops of suckers coming in. And at some point you run out of suckers. So that is a Ponzi scheme, especially when someone like a Bernie Madoff does it deliberately in a bubble. It also happens naturally. Nobody is orchestrating it but nonetheless the logic of it is the same as a Ponzi scheme. So basically, it’s a lot like pornography where you know it when you see it.

But it’s not just the fact that people are wrong but that people are wrong in a way that should have been predictable and where it’s really something that is sustained by the momentum, by the fact that other people keep on coming in until they don’t.

HCR: Okay, so when historians talk about this, they example they often use is tulips. It’s something that you can explain to people as a reference because it’s kind of a cool story. When you take it out of the economic system that we understand now, it’s easier to see.

PK: Yeah, I mean, I’m not really fond of the tulips analogy but sort of the first thing that people think of as being something like a modern bubble was the tulip mania in the Netherlands. 17th century Netherlands was not quite the first modern economy because they weren’t