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GDP is the Gross Domestic Product. It corresponds to the total value of domestic production of goods and services in a given country in a given year by residents within the national territory.
A distinction is made between nominal GDP (gross figures) and GDP-PPP (purchasing power parity), which compares countries according to a basket of standard goods, giving a better idea of the the wealth of countries by erasing exchange rates.
In this list, for the moment incomplete, nominal GDP is denominated in billions of USD$.