August CPI dropped at 8:30 this morning. The headline: 3.4% year-over-year, 0.4% month-over-month. Both in line with consensus. The S&P rallied nearly 1%. Four straight down days and the market finally exhaled.
But there are two numbers in this report. The headline is the one that made the news. The core is the one that matters.
The Number That Moved
The equity market saw 3.4% and celebrated “in-line.” The 2-year Treasury saw 0.3% core and jumped 6 basis points to 4.61%. These are two markets reading the same report and reaching opposite conclusions. Someone is wrong.
Where the Heat Lives
Core CPI strips out food and energy — the things that spike and revert. What’s left is the sticky stuff. And the sticky stuff just re-accelerated.
July core: +0.2% month-over-month.
August core: +0.3% month-over-month.
That reversal matters because the cooling story — the one the market has been trading for months — requires 0.2% or lower to be sustained. One month at 0.3% breaks the trend. And it wasn’t random noise. Look at what drove it:
| Component | July MoM | August MoM | Direction |
|---|---|---|---|
| Shelter | +0.1% | +0.3% | ↑ Re-accelerated |
| Communication | — | +2.3% | ↑ Hot |
| Lodging | — | +2.4% | ↑ Hot |
| Airline fares | — | +2.7% | ↑ Hot |
| Gasoline | — | +3.9% | (in headline, not core) |
| Medical care | — | -0.2% | ↓ Easing |
| Auto insurance | — | -0.8% | ↓ Easing |
Shelter is 40% of core CPI. It re-accelerated from +0.1% to +0.3% in a single month. Communication, lodging, and airfares — all services, all sticky, all accelerating. Medical care and auto insurance gave back ground, but they’re smaller weights and they move in both directions. The dominant story in core is services re-acceleration, led by the single biggest component.
The Pipeline
August PPI landed yesterday: +5.4% year-over-year, accelerating. Diesel was up 24.1%. PPI measures producer input costs. CPI measures what consumers pay. The lag between them is typically 2–4 months. That means today’s CPI — already showing core re-acceleration — hasn’t yet absorbed the full PPI pipeline.
And Brent is still above $100. Gasoline already accounted for over a third of the monthly headline increase. The September print will have an even larger energy contribution unless oil reverses sharply. It hasn’t.
What the Bond Market Is Pricing
The 2-year yield — the most rate-sensitive part of the curve — jumped to 4.61%. CME FedWatch shows 69.3% probability of a 25bp hike on September 16. Five days from now.
The logic is clean: core hot, shelter re-accelerating, PPI pipeline loaded, oil above $100, Warsh hawkish. This isn’t a close call for the bond market. It’s a hike.
The equity market sees 3.4% and says “it could have been worse.” The bond market sees 0.3% core and says “it just got worse.” History says: when they disagree, follow the bond market.
What This Means for the Book
TSM ($432, -0.2% from entry): Fine. TSM is a structural capex story — 12/12 confirmations on the AI spending chain. A 25bp hike doesn’t change the fact that every hyperscaler is building foundries. The risk to TSM is demand destruction at the macro level, and we’re not there yet. Ex-div September 16 (the same day as the FOMC decision). Hold.
APTV ($45.90, -6.9% from entry): This is where it gets uncomfortable. APTV is a cyclical play on insider conviction at a trough. A Fed hike into an already-weak consumer (sentiment at 47.6, a record low) is the bear case for cyclicals. The stop at $43 has 6.7% buffer — better than the 3.4% it had at the 52-week low last week. But FOMC is the real test. If they hike and guidance turns hawkish, cyclicals will take another leg down. The stop is the plan. No override.
The View from Here
This CPI print wasn’t catastrophic. It wasn’t the 3.6% headline or 2.6% core that would have forced an immediate reckoning. But it also wasn’t the 3.2% or lower that would have killed the hike. It landed in the worst possible zone: just hot enough to keep the hike alive, just mild enough for the equity market to pretend it didn’t.
The resolution comes Wednesday. If Warsh hikes, the equity relief rally from this morning gets unwound and then some. If the committee holds — despite core re-acceleration, PPI in the pipeline, and Brent above $100 — they’re betting that energy supply normalizes before inflation expectations de-anchor. That’s a bet, not a plan.
The right number in this report was 0.3%. The market read the other one.