gross domestic product (GDP), total market value of the goods and services produced by a country’s economy during a specified period of time. It includes all final goods and services—that is, those that are produced by the economic agents located in that country regardless of their ownership and that are not resold in any form. It is used throughout the world as the main measure of output and economic activity.
In economics, the final users of goods and services are divided into three main groups: households, businesses, and the government. One way gross domestic product (GDP) is calculated—known as the expenditure approach—is by adding the expenditures made by those three groups of users. Accordingly, GDP is defined by the following formula: GDP = Consumption + Investment + Government Spending + Net Exports or more succinctly as GDP = C + I + G + NX where consumption (C) represents private-consumption expenditures by households and nonprofit organizations, investment (I) refers to business expenditures by businesses and home purchases by households, government spending (G) denotes expenditures on goods and services by the government, and net exports (NX) represents a nation’s exports minus its imports.
The expenditure approach is so called because all three variables on the right-hand side of the equation denote expenditures by different groups in the economy. The idea behind the expenditure approach is that the output that is produced in an economy has to be consumed by final users, which are either households, businesses, or the government. Therefore, the sum of all the expenditures by these different groups should equal total output—i.e., GDP.
Each country prepares and publishes its own GDP data regularly. In addition, international organizations such as the World Bank and the International Monetary Fund (IMF) periodically publish and maintain historical GDP data for many countries. In the United States, GDP data are published quarterly by the Bureau of Economic Analysis (BEA) of the U.S. Department of Commerce. GDP and its components are part of the National Income and Product Accounts data set that the BEA updates on a regular basis.