World Development Report brought out by the World Bank in 2013 classified the countries into 3 groups.
- Countries with per capita income of US $ 12,600 and above per annum in 2012 are called high-income countries or rich countries,
- Countries with a per capita income of above US $1,035 and below the US $ 12,600 per annum in 2012 are called middle-income countries.
- Countries with a per capita income of US $1,035 or less per annum in 2012 are called low-income countries.