The most commonly used price index to track changes in prices for the typical household in the U.S.is:

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The consumer price index (CPI) is the most commonly used price index to track changes in prices for the typical household in the U.S. It measures the average change in prices paid by urban consumers for a fixed basket of goods and services, including food, housing, transportation, and medical care. The CPI is published by the Bureau of Labor Statistics and is widely used by businesses, policymakers, and investors to monitor inflation and adjust for cost-of-living increases.

The Most Commonly Used Price Index to Track Changes in Prices