What the press release actually says
The BLS press release leads with two numbers: the seasonally adjusted month-over-month change in headline CPI and the year-over-year change. Both are stated for the latest reference month, which is always the prior calendar month. Below the headline, the release breaks down the change into food, energy, and "all items less food and energy" (core), then walks through major component movements with brief commentary.
Two figures matter most for the immediate reaction:
- Headline YoY — what the press cites. This drives the political narrative and household-perception coverage.
- Core MoM — what the Fed and bond market actually trade off. A 0.1 percentage-point surprise versus consensus moves the 2-year Treasury yield meaningfully.
If a release has shelter as a big mover, that's worth a second look. Shelter is about 35 percent of the basket and is methodologically smoothed, so any sustained turn in shelter contributes substantively to the year-over-year picture for months.
What to ignore
One-month moves in volatile categories — used cars, lodging away from home, airline fares — generate noisy headlines that often reverse in subsequent prints. Single readings in these categories rarely change the underlying inflation story; persistent two- or three-month trends do.
"Supercore" services — core services excluding shelter — gets a lot of attention, and rightly so. But the supercore measure is itself volatile month to month. A three-month moving average is the standard smoothing approach, and judging supercore by a single print is a recipe for whiplash.
What the Fed actually targets
The FOMC's 2% inflation target is defined on the PCE price index, not CPI. The two move closely but not identically; core PCE typically runs 0.2 to 0.4 percentage points below core CPI on average because of differences in weighting, scope, and substitution methodology. See our CPI vs PPI vs PCE comparison for the full breakdown.
Even though PCE is the formal target, CPI typically gets more market attention because it releases earlier, has more granular sub-components, and feeds directly into TIPS and CPI-W (Social Security COLA) calculations. The Fed itself discusses CPI in its public communications, and Fed officials often cite specific CPI sub-aggregates.