In a riveting development that has economists dusting off their calculators and the rest of us checking our savings accounts, government bond yields are climbing to heights not seen in decades. Investors worldwide are dumping bonds like they're last season's tech stocks, and NPR's Scott Detrow called up University of Michigan economist Justin Wolfers - founder of Platypus Economics, because why not - to explain why everyone's so jittery and what it means for your wallet.

First, a quick refresher for those who slept through Econ 101: when the federal government needs cash, it doesn't stroll into a bank and ask for a trillion-dollar loan. That would get you laughed out of the lobby. Instead, it shouts into the void of the bond market, where investors historically line up to lend because they're fairly confident they'll get paid back. As Wolfers puts it, the government is in the business of printing numbers on paper and calling it money - a business model that inspires confidence, if not regulatory oversight.

So why the sudden panic? Plain and simple: interest rates are higher. The government is competing with you for that mortgage and with me for that car loan, and right now there's a lot more demand for loans. Two big borrowers are hogging the spotlight. First, the AI build-out: companies are borrowing billions (that's with a B, but soon a T) to construct data centers at breakneck speed. It might be transformative, but for now, it's just a lot of debt. Second, the federal government itself is borrowing at a rate that's basically unprecedented outside of wars or recessions, because taxes aren't covering spending. Shocking, we know.

But wait, you say, we've been worried about government debt for ages. What's changed? Wolfers points out that when you first started reporting on this, the numbers were in the billions. Now they're in the trillions. Government debt was about 30% of GDP before the 2008 financial crisis; now it's triple that. And nobody in Washington seems remotely serious about fixing it. The post-COVID moment to tighten belts came and went, and Congress and the White House have shown all the fiscal discipline of a kid in a candy store. Investors are losing faith that the American political system can ever deliver fiscal responsibility, which is a fancy way of saying they're not as confident the checks will keep coming.

Detrow bravely asks the possibly dumb question: if bond yields are higher, isn't that good for people lending money? Yes, if you're a wealthy investor with stacks of cash. But if you're a regular human with a mortgage, a car loan, or student debt, your interest rates just went up too. And as Wolfers notes, the federal government will have to spend more on its credit card bill, leaving less for roads, schools, police, and the military - the stuff we actually like.

Can this trend reverse? Wolfers offers a few possibilities: we could magically get our fiscal act together (Detrow, ever the realist, is skeptical), the AI boom could fizzle out, or people could suddenly start saving more. Because when the supply of loans goes up, the price - interest rates - tends to drop. But until then, we're all just along for the ride.

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