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The U.S. Yield Curve Just Inverted. That’s Huge.

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The U.S. Treasury yield curve just inverted for the first time in more than a decade.

It’s a moment that the world’s biggest bond market has been thinking about for the past 12 months. I wrote around this time last year that Wall Street had come down with a case of flattening fever, with six of the 11 analysts I surveyed saying that the curve from two to 10 years would invert at least briefly by the end of 2019. That’s not exactly what happened Monday, though that spread did reach the lowest since 2007. Rather, the difference between three- and five-year Treasury yields dropped below zero, marking the first portion of the curve to invert in this cycle.

The move didn’t come out of nowhere. In fact, I wrote a week ago that the spread between short-term Treasury notes was racing toward inversion, and Bloomberg News’s Katherine Greifeld and Emily Barrett noted the failed break below zero on Friday. Still, I wasn’t necessarily expecting this day to come so soon. Rate strategists have long said that being close doesn’t cut it when talking about an inverted yield curve and the well-known economic implications that come with it, namely that the spread between short- and long-term Treasury yields has dropped below zero ahead of each of the past seven recessions.

It’s important to keep in mind the timeline between inversion and economic slowdowns — it’s not instantaneous. The yield curve from three to five years dipped below zero during the last cycle for the first time in August 2005, some 28 months before the recession began. That this is the first portion to flip isn’t too surprising, considering how much scrutiny bond traders place on the Federal Reserve’s outlook for rate increases. All it means is that the central bank will probably leave interest rates steady, or even cut a bit, in 2022 or 2023. I’d argue that’s not just possible, but probable, given that we’re already in one of the longest economic expansions in U.S. history.

The more interesting question might be why this part of the yield curve won the race to inversion, rather than the spread between seven- and 10-year Treasuries, which looked destined to fall below zero earlier this year. One reason could be that the Fed’s balance-sheet reduction is putting more pressure on 10-year notes than shorter-dated maturities, which wasn’t the case during past periods of inversion. Indeed, policy makers have shown no signs of easing up on this stealth tightening.

On top of that, the Treasury Department is selling increasing amounts of debt, which disproportionately affects the longest-dated obligations because buyers have to consider the duration risk they’re absorbing. Remember the curve from five to 30 years, which fell below 20 basis points in July? That spread is about 46 basis points now, driven by stubbornly higher long-bond yields.

Given the recent pivot from the most important Fed leaders — Jerome Powell, Richard Clarida and John Williams — this flirtation with inversion among two-, three- and five-year Treasury notes probably isn’t going away. The bond market is fast approaching the point where traders have to ask themselves whether a rate hike now increases the chance of a cut in a few years. Other questions include “what is neutral?” and “can the Fed engineer a soft landing?” To say nothing about whether the assumed relationship between the labor market and inflation expectations is still intact.

Those are big questions without easy answers, and the first inversion of the U.S. yield curve offers only one clue. The Fed wants to be more data dependent going forward. Odds are the market will do the same.