CPI Today — US Consumer Price Index & Current Inflation

What is CPI?

The Consumer Price Index for All Urban Consumers (CPIAUCSL) measures the average change over time in the prices paid by urban consumers for a representative market basket of goods and services. Published monthly by the US Bureau of Labor Statistics and indexed to a 1982-1984 baseline of 100, CPI is the most widely cited inflation measure in the world. The index covers food, energy, shelter, apparel, transportation, medical care, recreation, education, and other services, with weights based on consumer expenditure surveys. The headline year-over-year change in CPI is what most people mean when they refer to "the inflation rate." Core CPI (which excludes food and energy) is preferred by the Fed for trend signal because the excluded categories are volatile. CPI directly indexes Social Security cost-of-living adjustments, federal income tax brackets, Treasury Inflation-Protected Securities (TIPS) payouts, and many private contracts including labor agreements and commercial leases.

Why CPI matters for stocks

CPI prints are the single most market-moving monthly data release in the United States. Hotter-than-expected CPI raises odds of more Fed tightening, which compresses equity multiples and strengthens the dollar. Cooler prints typically rally bonds and high-duration equities like technology and biotech. Persistent inflation favors hard-asset sectors — energy, materials, real estate, and gold producers — while crushing companies with pricing-power weakness. The Fed targets 2% on the personal consumption expenditures (PCE) deflator rather than CPI, but the two move together and CPI prints first, so markets treat CPI as the leading read on the inflation regime.

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