Question

why is total income not useful measure for comparison between two countries

Answer 1

Hey friend here is your answer..

Answer 2

because total income doesn't include the measure of population difference between the two countries.

if India's total income is ₹30, and UK's total income is ₹25, we cannot conclude India to be richer than UK. because, India may have to share ₹30 with her population of 135 while UK might be having only 65 people to share their income of ₹25.

So each citizen of UK can now have 0.38 paisa (ie.,₹25/65). wheras Each Indian can have only 0.22 paisa (ie., ₹30/130).

Obviously UK may have lot of extra money to spend on other activities while India may have to borrow loan from other countries to meet the yearly expenditure for her huge population.