CPI (Chinese name: consumer price index, English full name: Consumer Price Index) is a macroeconomic indicator reflecting the changes in the price level of consumer goods and services generally purchased by households, and it is one of the main indicators to measure inflation.

It is a relative number to measure the price level of a representative group of consumer goods and services that changes with time in a specific period, and is used to reflect the changes in the price level of consumer goods and services purchased by households.