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The inversion has unwound, but history suggests this isn't a recovery—it's a warning.
The yield curve is the market's de facto read on the macro regime. A positive 10Y-2Y spread looks like normalization. But are we there yet? Probably not. Historically, dis-inversion is the phase where the floor falls out. The 2001 and 2008 recessions both began after the curve steepened back above zero — exactly where we are now.
By the numbers: by mapping the US Treasury yield curve (10-Year minus 2-Year Constant Maturity) going back to 1990 and applying a binary segmentation algorithm, then running rolling F-tests, we can identify points where the fundamental mean and volatility of the yield curve shifted, partitioning the last 35 years into six distinct macro regimes, as shown below.
The yield curve is not just reacting to standard business cycle fluctuations; its structural baseline has been violently reset.
The End of ZIRP Dominance: Between 2008 and 2017, the curve slope averaged a steep 1.5% to 2.0% because short rates were pinned at zero. The current regime proves that the zero-lower-bound (ZLB) anchor has been fully dislodged.
Structural Flatness: The current cycle is the first time since the pre-GFC era (2005–2008) that the yield curve has sustained a deeply flat or inverted posture for a multi-year stretch.
Regime Change: Beyond just the rates, the context is that we are indeed operating under a new set of rules driven by higher terminal rates, resilient growth, and the return of an inflation premium.
If we isolate the current "Inflation Tightening" regime (mid-2022 to present) and compare it to the prior "Late Cycle & COVID" regime (late 2017 to mid-2022), test results show a level shift, though not a volatility shift:
Mean Shift: The prior cycle averaged a +0.54% slope; the current one averages -0.09%. A t-test (t=-7.08, p<0.0001) shows the two regimes are statistically distinct.
Volatility Shift: The curve looks bumpier now, but the evidence is not strong enough to say the shift is statistically significant (F=1.57, p=0.11).
While treasuries will tell only part of the story, giving it some structure can help us put things in perspective and make sense of the moment we're living.
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