Econ Blog
CPI vs Core PCE
Headline CPI makes the news. The Fed sets its 2% goal on PCE and reads Core PCE for the trend. The chart tracks both, and the gap between them.
Headline CPI is the most-cited inflation number in the financial press, but the Federal Reserve defines its 2% target on the overall PCE price index and leans on Core PCE (PCE excluding food and energy) to read the underlying trend. The two measures can sit on opposite sides of that target, and the gap between them matters.
August 2026 YoY
August 2026 YoY, the Fed's trend gauge
Core PCE minus headline CPI, percentage points
The arc so far: 2021 acceleration, a mid-2022 peak near 9.0%, then disinflation through 2023-24. Read the latest value off the chart, not off a headline, and remember the shape doesn't tell the whole story, because Core PCE moves differently.
Why the Fed watches Core PCE, not CPI
Core PCE and headline CPI can differ by a wide margin in either direction, for two structural reasons:
- Methodology. PCE's consumption-weighted basket updates more frequently than CPI's fixed basket, so it captures substitution effects (people switching from beef to chicken when beef prices spike) that CPI misses.
- Composition. Core PCE excludes the volatile food + energy components by definition. Headline CPI includes them, which makes the number more sensitive to oil price shocks but less useful as a gauge of underlying price pressure.
The two series have traded places more than once since 2021. The Fed's 2% target is defined on PCE, and Core PCE is the trend gauge the FOMC cites, so this is the series to watch for the policy reaction.
The Committee judges that the risks to achieving its employment and inflation goals continue to move into better balance.
The practical takeaway
For investors and analysts, watch both:
- Headline CPI drives the public narrative response: what newspapers call "the inflation rate," what voters react to, what the BLS report leads with.
- Core PCE drives the FOMC reaction function: what determines whether and when the Fed cuts or holds.
Related analysis
- Retail gasoline vs CPI energy: The energy price households and small businesses feel first, and where it diverges from the CPI basket.
- Global oil supply and demand: The crude balance that sits upstream of the energy component of inflation.
- The 10Y minus 2Y Treasury spread: The rates signal that moves with the Fed's reaction to the inflation trend.
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