AI Bubble? The Real Danger Is Tight Credit Spreads

The question of the moment in markets is whether we are in an AI bubble, as stocks seem awfully expensive amid hopes that artificial intelligence will transform the economy. But there is another curiosity that is far more concerning: low credit spreads. That suggests a low-risk environment — which describes precisely nothing about this market.

The credit spread is a measure of the difference in yield between high- and low-risk bonds. Risky debt is normally low-rated corporate or emerging-market bonds. Both tend to trade at a much higher rate because there is a higher risk of default or future volatility. And yet spreads on risky corporate debt are low by historic standards.

That means one of two things: Either these bonds aren’t so risky — or markets are underpricing risk. That second scenario never ends well.

BB underpricing graph

To be sure, there are reasons not to worry, or to worry for a different reason. The yields on these bonds are higher than they were several years ago; it’s the difference between them and the low-risk bonds that is smaller. And that’s because risk-free bond yields, such as a 10-year Treasury, are much higher.

BB spreads lower

This could be because risk-free bonds aren’t looking so safe anymore. Not only is the US government taking on a lot of debt, but the future of trade, inflation and the dollar looks uncertain. All of that increases bond yields. It’s also possible that the difference between risky and risk-free just isn’t as meaningful as it used to be, so the credit spread isn’t the measure of risk that it once was.