Consumer Price Index
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The Consumer Price Index (CPI) is a measure of the average change over time in prices paid by urban consumers for a basket of goods and services. It is a measure of inflation, which is the rate at which prices for goods and services are rising. The CPI is calculated by taking the average price of a basket of goods and services in a given month and dividing it by the average price of the same basket of goods and services in a base month. The CPI is then multiplied by 100 to create an index number. An index number of 100 means that the prices of the goods and services in the basket have not changed since the base month. An index number of 110 means that the prices of the goods and services in the basket have increased by 10% since the base month.
History
The CPI was first developed in the United States in the early 20th century. The first CPI was published in 1913 and covered only a few cities. Over time, the CPI has been expanded to include more cities and more goods and services.
Uses
The CPI is used for a variety of purposes, including:
- Measuring inflation: The CPI is the most widely used measure of inflation in the United States. It is used by the Federal Reserve to set interest rates, by businesses to set prices, and by consumers to make informed decisions about their spending.
- Adjusting wages and benefits: The CPI is used to adjust wages and benefits for inflation. For example, many labor contracts include a cost-of-living adjustment (COLA) that increases wages and benefits in line with the CPI.
- Indexing investments: The CPI is used to index investments, such as bonds and annuities, for inflation. This ensures that the value of the investment will not decrease over time due to inflation.
Strengths
The CPI has several strengths, including:
