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.
State Domestic Product
State Domestic Product, or SDP, is the total value of goods and services produced during any financial year within the geographical boundaries of a "state". Also called the "state income", SDP is always calculated or estimated in monetary terms, and is instrumental in the evaluation of per capita income. "State" here refers to a country subdivision, as in the states of the United States and the states of India. While GDP gives a good estimate of the entire nation's output, SDP provides more detailed economic details about subnational territories.