What is gross domestic product (GDP)?

Gross domestic product is the monetary value of final goods and services produced within an economy during a period. It measures the scale of production. GDP is a flow of production rather than a stock of wealth; citizenship and production within a territory are different criteria.

How is GDP calculated?

1. Final products and value added The same production must not be counted repeatedly. Since flour’s value is included in bread’s selling price, adding both full values creates double counting. The production approach measures value added at each stage. Reselling a used item is not new production, although an associated brokerage service can be. 2. The expenditure approach The basic expression is consumption + investment + government purchases of goods and services + exports − imports. Imports are deducted to remove foreign production included in other expenditure components. This does not mean imports are always harmful. Transfer payments are not directly government production expenditure. 3. The income approach Production also generates workers’ income and business earnings. Production, expenditure and income approaches measure different sides of the same activity. Data sources and timing can produce statistical differences and later revisions.

How should GDP figures be interpreted?

4. Nominal and real values Nominal GDP is calculated at current prices. Real measures separate price changes to focus on the volume of production. Rising prices may increase the nominal value without a corresponding increase in output. 5. GDP per capita Dividing total GDP by population produces an average indicator. It does not mean everyone has the same income or receives that amount of money. Exchange rates and purchasing-power differences matter in international comparisons. 6. Limits as a welfare measure Income distribution, unpaid household work, environmental damage and quality of life are not fully captured. GDP should therefore be considered alongside health, education, employment and inequality indicators. GDP growth alone does not prove that everyone’s life has improved.