A statistical estimate of the level of prices of goods and services bought for consumption purposes by households. It is calculated as the weighted average price of a market basket of consumer goods and services. Changes in CPI track changes in prices over time. The items in the basket are updated periodically to reflect changes in consumer spending habits. The prices of the goods and services in the basket are collected (often monthly) from a sample of retail and service establishments. When a sampled item is replaced by one of a different quality, compilers may adjust its price so that the index reflects price change rather than the quality difference.
How CPI is Calculated
The CPI is calculated as the weighted average price of a market basket of consumer goods and services.
- Basket of goods and services: The basket includes items that represent the typical consumption patterns of households.
- Weighted average: The prices of the items in the basket are weighted according to their importance in the overall consumption pattern.
- Periodic updates: The basket is updated periodically to reflect changes in consumer spending habits.
Uses of CPI
Changes in the CPI can be used to track inflation over time and to compare inflation rates between different countries.
- Tracking inflation: The CPI is a key indicator of inflation, which is the rate at which the general level of prices for goods and services is rising.
- Comparing inflation rates: The CPI can be used to compare inflation rates between different countries or regions.
- Adjusting for inflation: The CPI is often used to adjust financial figures, such as wages or benefits, for inflation.
