Question

what is the main criterion used by the world bank in classifying different countries

Answer 1

The criterion used is per capita income. 

Limitations

(a) It covers only the economic aspect ignoring factors like infant mortality rate, literacy rate, no attendance ratio for class I-V, etc which are important indicators for development.

(b) This method also does not provide us the distribution different levels of income.

Answer 2

Per Capita Income is the main criterion used by the World Bank in classifying different countries.