The CPI (Consumer Price Index) and the GDP deflator are both measures of inflation in a country, but they are very different. The primary distinction between the two is that the CPI measures the average cost of goods and services to households, while the GDP deflator measures the overall level of prices in the economy. To help you better understand the differences between the two, here is a detailed overview.

1. Definitions

The CPI is an index that measures the average change in prices for a basket of consumer goods and services purchased by households. The CPI is calculated from the changes in the prices households pay for these goods and services over time. The basket includes items such as food and beverages, housing, clothing, transportation, and medical care, and is updated every quarter based on consumer spending surveys.

The GDP deflator, on the other hand, is a measure of the change in prices of all goods and services produced in a country at a given point in time. It is calculated by dividing the country’s nominal Gross Domestic Product (GDP) by its real (inflation-adjusted) GDP and multiplying that quotient by 100.

2. Components Used

The CPI measures the changes in prices of different goods and services that households consume. It takes into account the prices of such items as food and beverages, clothing, housing, and transportation. The main components used to calculate the CPI are services, durable goods, nondurable goods, and rental prices.

The GDP deflator, on the other hand, measures the prices of all goods and services produced in a country over a given period of time. It includes the prices of both consumer and producer goods, as well as those of capital assets such as machinery and buildings. The GDP deflator takes into account the prices of both tradeable and non-tradeable items.