The Consumer Price Index for All Urban Consumers: All Items (CPIAUCSL) is a price index of a basket of goods and services paid by urban consumers. Percent changes in the price index measure the inflation rate between any two time periods. The most common inflation metric is the percent change from one year ago. It can also represent the buying habits of urban consumers. This particular index includes roughly 88 percent of the total population, accounting for wage earners, clerical workers, technical workers, self-employed, short-term workers, unemployed, retirees, and those not in the labor force. The CPIs are based on prices for food, clothing, shelter, and fuels; transportation fares; service fees (e.g., water and sewer service); and sales taxes. Prices are collected monthly from about 4,000 housing units and approximately 26,000 retail establishments across 87 urban areas. To calculate the index, price changes are averaged with weights representing their importance in the spending of the particular group. The index measures price changes (as a percent change) from a predetermined reference date. In addition to the original unadjusted index distributed, the Bureau of Labor Statistics also releases a seasonally adjusted index. The unadjusted series reflects all factors that may influence a change in prices. However, it can be very useful to look at the seasonally adjusted CPI, which removes the effects of seasonal changes, such as weather, school year, production cycles, and holidays. The CPI can be used to recognize periods of inflation and deflation. Significant increases in the CPI within a short time frame might indicate a period of inflation, and significant decreases in CPI within a short time frame might indicate a period of deflation. However, because the CPI includes volatile food and oil prices, it might not be a reliable measure of inflationary and deflationary periods. For a more accurate detection, the core CPI (CPILFESL (https://fred.stlouisfed.org/series/CPILFESL)) is often used. When using the CPI, please note that it is not applicable to all consumers and should not be used to determine relative living costs. Additionally, the CPI is a statistical measure vulnerable to sampling error since it is based on a sample of prices and not the complete average. For more information on the CPI, see the Handbook of Methods (https://www.bls.gov/opub/hom/cpi/), the release notes and announcements (https://www.bls.gov/cpi/), and the Frequently Asked Questions (https://www.bls.gov/cpi/questions-and-answers.htm) (FAQs).
Why This Matters
CPI is the primary inflation measure used by the Federal Reserve for its 2% inflation target. Rising CPI indicates inflationary pressure, while falling CPI suggests deflation risk. Includes volatile food and energy prices, making core CPI often more relevant for policy decisions. Critical for cost-of-living adjustments and real return calculations.
Trading Implications
CPI releases directly impact Federal Reserve policy expectations and market pricing. Rising CPI above 3% typically pressures bonds and rate-sensitive sectors while benefiting commodity stocks and real assets. Monthly changes of 0.3%+ often trigger significant market moves. Traders position ahead of releases using options strategies, as volatility spikes are common. Energy and food components can provide false signals, making trend analysis crucial.
Data Details
- Source: U.S. Bureau of Labor Statistics
- Frequency: Monthly, Seasonally Adjusted
- Units: Index 1982-1984=100