It is easier to compare things when we compare them using a particular criterion or characteristic. Countries with more income are considered more developed than other countries that have less income. The income of a country is the sum of the incomes of its entire population.
Different countries of the world have different populations, so total income is not a reliable criterion to compare national development. A more reliable criterion for comparing national development is the average income or per capita income. Average income of a country= Total income of the country/ Population of the country.
Based on its per capita income, India falls in the category of low-income countries. Per capita income hides individual income disparities. Countries with equitable distribution of income have no rich and no poor. Countries without equitable distribution of income have rich and poor people.