To determine the richest countries in the world, 24/7 Wall St. reviewed data on GNI per capita for 194 countries and special regions with available data from the World Bank. The World Bank estimates GNI per capita using the purchasing power parity method, and figures are in current international dollars. All data on GNI per capita is based on the most recent available year for a given country.
Additional data on GDP in current U.S. dollars, population, and life expectancy at birth also came from the World Bank. All data are for the most recent year available for every country.
We also considered data on levels of public sector corruption from the nonprofit, international watchdog and anti-corruption group, Transparency International.