Q1. To compare countries, their income is considered to be one of the most important attributes. Countries with higher income are more developed than others with less income. As different countries have different populations, comparing total income will not tell us what an average person earns. So, we compare the average income of countries.

Q1. To compare countries, their income is considered to be one of the most important attributes. Countries with higher income are more developed than others with less income. As different countries have different populations, comparing total income will not tell us what an average person earns. So, we compare the average income of countries.