Gross domestic product (GDP) is the most widely used measure of the size of an economy. It represents the total market value of all finished goods and services produced within a country's borders over a given period, usually a quarter or a year.
How GDP is calculated
The most common approach adds up spending: household consumption, business investment, government spending, and net exports (exports minus imports). In principle, three methods — spending, income earned, and value added at each production stage — should arrive at the same total.
Nominal vs real GDP
Nominal GDP measures output at current prices, so it rises with inflation even if nothing more is produced. Real GDP adjusts for price changes, revealing whether the economy actually produced more. GDP per capita (GDP divided by population) is often used for rough comparisons of average economic output between countries — though it says nothing about how that output is distributed.
What GDP leaves out
GDP is a measure of production, not wellbeing. It excludes unpaid work such as childcare and housework, ignores environmental damage and resource depletion, counts some harmful spending (like cleaning up pollution) as positive, and says nothing about inequality. Economists have proposed complementary measures — covering health, education, sustainability and happiness — but none has replaced GDP as the headline indicator.
Why GDP still matters
Despite its limits, GDP movements shape real decisions: central banks watch growth when setting interest rates, governments use it for budgets and forecasts, and businesses read it as a signal of demand. Two consecutive quarters of falling real GDP is a common rule of thumb for identifying a recession, though official dating is more nuanced.
This article is general educational information, not financial advice.