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PCE vs. CPI: Why the Fed Watches a Different Inflation Gauge

The inflation number that dominates headlines is usually CPI, the Consumer Price Index. But the Federal Reserve's official inflation target is built around a different measure entirely: the Personal Consumption Expenditures price index, or PCE, published monthly by the Commerce Department's Bureau of Economic Analysis. Both track how much prices for goods and services are rising, but they're built differently, and those differences matter for how each reacts to the same economy. The biggest difference is what each index measures spending on and how it adjusts to changing behavior. CPI is based on a fixed-ish basket of goods a typical urban household buys, updated only periodically, and it's sourced from surveys of what consumers say they buy. PCE is sourced from business revenue data (what companies report actually selling) and covers a broader scope of spending, including costs paid on consumers' behalf by employers or the government, like employer-sponsored health insurance. PCE is also chain-weighted, meaning its basket updates continuously as people substitute away from goods that get more expensive — if beef prices spike and people buy more chicken, PCE captures that shift in real time, while CPI is slower to adjust. That substitution effect is a major reason PCE inflation almost always runs a bit cooler than CPI inflation for the same period. PCE also weights housing and shelter costs less heavily than CPI does, which matters a lot in periods when rent and home prices are moving sharply. The Fed explicitly targets 2% annual PCE inflation, not CPI, because it considers PCE the more complete and methodologically accurate gauge of what households actually experience. That's why, on days like today, the market reaction to a PCE print can diverge from what a similar CPI number would have triggered — investors and the Fed are both calibrated to this specific series, and its trend, not its headline number in isolation, is what drives rate-decision odds.