美國cpi

The U.S. consumer price index (CPI) is a measure of the average change in prices over time in a fixed basket of goods and services purchased by households. It is calculated by the Bureau of Labor Statistics (BLS) of the U.S. Department of Labor.

The CPI is a widely used measure of inflation. It is used by the government, businesses, and consumers to track changes in the cost of living. The CPI is also used to adjust Social Security benefits and other government payments.

The CPI is calculated using a sample of about 80,000 households

The households are selected to represent the entire U.S. population. The BLS collects data on the prices of about 800 items from these households. The items are weighted based on their importance in the consumer basket. The weights are updated every year.

The CPI is divided into two main categories:

Urban consumers
All urban consumers

The CPI for urban consumers (CPI-U) is the most widely used measure of inflation. It measures the change in prices for goods and services purchased by households in urban areas.

The CPI for all urban consumers (CPI-U) measures the change in prices for goods and services purchased by all households, including those in rural areas.

The CPI is a valuable tool for understanding inflation

It provides a measure of the average change in prices over time. The CPI can be used to track changes in the cost of living, adjust government payments, and make economic decisions.

Here are some of the limitations of the CPI:

It does not measure the change in prices for all goods and services.

It is not a perfect measure of inflation.

It can be affected by changes in the composition of the consumer basket.

Despite these limitations, the CPI is a valuable tool for understanding inflation. It is a widely used measure that provides a snapshot of the change in prices over time.