It is interesting to see that the CIA World Factbook has reranked over 200 countries or areas on the basis of GDP in which the USA stands at the 3rd place following China and EU. Also, it changed the economic components of the States by increasing its physical economy to about 22.3% of its entire GDP.

Some arguments can be made though. For example, GDP per capita in 2014 are overestimated for countries like Iraq, Brazil, Mexico, and underestimated for nations like North Korea, India, UK. For example, North Korea per capita GDP should be higher than Iraq; India higher than Brazil; UK higher than Japs.

A basic criterion to estimate real GDP per capita of a nation is the value of annual electricity production (kwh) per capita, which is strongly correlated with the value of physical GDP per capita in a nation. You cannot expect a country has lower electricity production to produce higher GDP. That is impossible.