Gross domestic product
The total value of everything an economy produces in a period; the measure the indicators here are trying to anticipate.
GDP is the sum of final goods and services produced within a country's borders, valued at market prices. Real GDP removes inflation. On worldstat.us GDP is shown for context only, because it arrives late and is revised; the indicators are chosen because they move before it. Current-dollar GDP from the World Bank also sets the weight of each region in the world score.