To determine if the richest countries of the world, Forbes magazine estimated the GDP per capita and purchasing power of people in 182 countries. IMF data starting from 2010 onwards.
In order to make comparisons between different countries use a special factor taking into account the standard of living and the inflation rates. The richest in this list is a small State, located in the Persian Gulf, Qatar. It's grown rich through the State oil and gas. Curious what most of the people of this State are not so rich!