The world bank use the Gross National Income per capital.
One of the task performed by the World Bank is that they assigns the World's economies into four income groups which are low income countries, lower-middle income countries, upper-middle income countries, and high-income countries.
In conclusion, the World bank use the Atlas method to determine the status of a nation and use GNI per capita to classify the nation accordingly.
Learn more about GNI per capita here
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