For comparing the developmental level of different countries, their income is considered to be one of the most important attributes. The countries with higher income are more developed than others with less income. For comparison between countries, we consider the per capita income of each country. In World Development Report, countries are recognised as rich country and low-income country according to their per capita Income. With more income, people Will be able to get more things they need. So, greater income itself is considered to be an important criterion for the development of a country.