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.
List of countries by GDP (PPP) per capita
There are many natural economic reasons for GDP-per-capita to vary between jurisdictions (e.g. places rich in Oil & Gas reserves tend to have high GDP-per-capita figures). However, it is increasingly being recognized that tax havens, or corporate tax havens, have distorted economic data which produces artificially high, or inflated, GDP-per-capita figures. It is estimated that over 15% of global jurisdictions are tax havens (see tax haven lists). An IMF investigation estimates that circa 40% of global FDI flows, which heavily influence the GDP of various jurisdictions, are described as "phantom" transactions.