SEP · ISSUE 37 · September 8, 2026
CONCEPTCPI vs PCE: the headline gauge and the Fed's gauge
CPI fills headlines. But the Fed grades its 2% target with a different index, PCE. Knowing the difference saves you some scares.
CPI
HEADLINE
the news one
PCE
FED
the one that sets rates
TARGET
2%
measured in PCE
THE IDEA
TWO RULES
two ways to measure the same inflation
CPI tracks a fixed basket of prices from a household's view. PCE tracks what people actually buy and how their spending shifts. The Fed prefers the second, which is why it sometimes reacts differently than you expected.
TO GET IT
SIMPLE RULE×2
×2
housing's weight in CPI vs PCE
If rents spike, CPI feels it far more than PCE. That's why the headline can scare you while the gauge the Fed watches barely moves.
Housing carries roughly twice the weight in CPI that it does in PCE. That one detail makes the two indexes tell different stories.
- WEIGHTING
- — How much each spending category counts inside the index.
- HOUSING
- — Rent and the cost of your home. The largest line in CPI.
EXAMPLE
THE KEYDon't watch the index that shouts, watch the one that decides
“The inflation that moves your rates isn't the headline one, it's the one the Fed picks to grade against.”
The market sometimes moves on CPI, then corrects when PCE arrives. Knowing which one counts gives you an edge.
- CORE
- — Inflation excluding food and energy. The version the Fed watches closely.
- TARGET
- — The 2% the Fed treats as stable inflation, measured in PCE.
TO GET IT
THE GAPWhy CPI almost always runs higher
Illustrative curve of the CPI-minus-PCE gap. Almost always positive: the headline tends to overstate versus the gauge that decides.
CPI usually prints slightly hotter than PCE. The gap comes from how each basket is built.
- GAP
- — The difference between two measures of the same thing.
- SUBSTITUTION EFFECT
- — When something rises, people buy alternatives. PCE captures this; CPI less so.
TO GET IT
SIDE BY SIDETwo ways to measure the same price rise
CPI
The news one
- Surveys urban households on what they pay.
- A more fixed basket: slow to reflect you switching brands.
- Housing weighs heavily, so rent dominates.
PCE
The Fed's one
- Tracks what people actually buy, businesses included.
- A basket that adapts as your spending habits change.
- Captures the healthcare your insurer pays, not just you.
It's not that one is right and one is wrong. They measure similar things with different rules.
- COVERAGE
- — Which spending each index includes. PCE covers more than CPI.
- SPENDING HABIT
- — How you split your money. PCE updates it faster.
EXAMPLE
THE BASKETHow a typical CPI basket splits up
Illustrative split of the CPI basket. Housing is the biggest line, which is why it dominates the inflation headline.
Once you see housing take nearly a third, you understand why CPI reacts so much to rent.
- BASKET
- — The set of spending whose prices are tracked to measure inflation.
- LINE
- — Each spending group inside the basket (housing, food...).
EXAMPLE
HOW IT'S PLAYEDInstruments tied to inflation
| TIP | ~108 | → illustr. | Treasury bonds tied to inflation. Their principal adjusts with CPI. |
| VTIP | ~49 | → illustr. | Short-term TIPS. Less sensitive to rates, more of a pure inflation play. |
| SCHP | ~52 | → illustr. | A broad basket of TIPS. Diversified exposure to US inflation. |
| SPTS | ~29 | → illustr. | Short nominal Treasuries. A benchmark to compare against TIPS. |
An evergreen concept, not a recommendation. Levels are approximate, just to illustrate; not today's prices.
- TIPS
- — Treasury bonds whose value adjusts with inflation (CPI).
- BREAKEVEN
- — The inflation the market prices in, comparing a normal bond and TIPS.
- ILLUSTR.
- — Indicative level, only to explain the concept.
WRAP
FOLLOWCan you tell CPI from PCE now?
Next time an inflation headline moves the market, you'll know whether it's the gauge that actually decides. Share it if it helped.
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- CPI
- — Consumer Price Index. The news number.
- PCE
- — Personal Consumption Expenditures. The one the Fed uses for its 2% target.