The market’s circuit breaker

When the long bond breaks the weakest borrowers, the long bond eventually comes down.

Please take a look at the chart below. It plots the US 30-year yield (blue) against CCC & lower option-adjusted spreads on an inverted axis (gray), so a falling gray line means credit stress is rising.

For most of the past 20 years, the two lines moved together. In 2008 and again in 2020, CCC spreads blew out and the 30Y collapsed right alongside them. Stress built at the bottom of the credit spectrum, capital ran to safety, and long yields fell.

Now look at the far right. The 30Y has pushed above 5.5%, while CCC spreads have started to gap wider, roughly 12% over Treasuries. The lines are diverging.

Here's what that means:

📈 Higher long-term yields raise refinancing costs for the weakest balance sheets first.

⚠️ CCC-rated borrowers have the least cushion, so they show the strain first.

📉 As spreads widen and defaults build, demand for duration and safety returns.

🔄 That demand pulls long yields back down.

In other words, the market has a built-in circuit breaker. Rising yields can't run indefinitely when the lowest-quality credits can't absorb them.

This isn't a timing signal, and divergences can last longer than anyone expects. But if you're watching the 30Y, I'd also be watching the bottom of the credit curve, because that's where the pressure is showing up first.

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