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CPI Explained: What Goes Into the Inflation Basket — and Why Shelter Weighs So Much

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  When the Bureau of Labor Statistics (BLS) reported that US consumer prices rose 3.7% in the 12 months to September 2026, that single number hid a split story. Gasoline was up 34.2% from a year earlier. Shelter was up 3.2%. Food was up 2.5%. Core prices, which leave out food and energy, were up 2.6%. The headline is not an average of those percentages. It is a weighted average, and the weights explain most of the confusion about inflation. All figures in this post come from the BLS Consumer Price Index release for September 2026 (USDL-26-1574, published October 14, 2026), unless noted otherwise. The basket is spending, not a shopping list The Consumer Price Index for All Urban Consumers (CPI-U) tracks the prices of a fixed basket of goods and services that urban households buy for day-to-day living: food, clothing, shelter, fuels, transportation, medical care, and more. It covers urban consumers, who make up over 90% of the US population. People living in rural nonmetropolitan are...

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CPI Explained: What Goes Into the Inflation Basket — and Why Shelter Weighs So Much