gross domestic product
/ GDP, say it as the three letters: jee-dee-pee /
Imagine you wanted to put a single price tag on everything a whole country made and sold in one year: every haircut, every car, every cup of coffee, every doctor's visit, every new house. Add it all up into one giant money number and you have gross domestic product, almost always shortened to GDP. It is the most famous statistic in economics, the one that newspapers mean when they say an economy is shrinking or booming.
More precisely, GDP is the total market value of all final goods and services produced within a country's borders during a period, usually a year or a quarter. Two words do a lot of work here. Final means we only count the finished thing a customer buys, not the parts along the way, so we do not double-count by adding both the flour and the bread. Within a country's borders means it counts production that happens inside the country no matter who owns the factory, which is the difference between GDP and its cousin gross national product. If a country made 100 loaves of bread sold at 2 dollars and 50 haircuts sold at 20 dollars, that slice of GDP would be 100 times 2 plus 50 times 20, which is 200 plus 1000, equal to 1200 dollars.
GDP matters because it is the closest thing we have to a single scoreboard for a national economy, used to compare countries, to see if living standards are rising, and to decide policy. But treat it with respect, not worship. GDP measures the size of market activity, not happiness, not health, not fairness, and not the unpaid work done at home. A country can have a large GDP and deep problems. It answers the question how much did we produce, and that is a useful question, but it is not the only question worth asking.
When a news report says an economy grew 3 percent last year, it almost always means real GDP rose 3 percent: the country produced 3 percent more goods and services after stripping out price changes. That single number then drives talk about jobs, wages, and whether the government has money to spend.
Most headline growth figures are real GDP growth.
GDP is not a measure of welfare or wellbeing. Its inventor, Simon Kuznets, warned in the 1930s that the welfare of a nation can scarcely be inferred from a measurement of national income. A bigger GDP is not automatically a better life.