List of countries by GDP (nominal)
Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates. Nominal GDP does not take into account differences in the cost of living in different countries, and the results can vary greatly from one year to another based on fluctuations in the exchange rates of the country's currency. Such fluctuations may change a country's ranking from one year to the next, even though they often make little or no difference in the standard of living of its population.
National Income and Product Accounts
The sum of the four production categories is gross domestic product, the value of all domestic expenditures on goods and services. GDP (income) must equal GDP (production) except for any rounding error that accumulates when the data used to prepare a table includes rounding at prior stages of analysis, as appears to have happened in this case.