Question

why do you think average income is an important caterriea for development explain

Answer 1

answer1))))It is an important criterion because it gives some idea about the rising standard of living. Prosperity of a country depends not only on the size of its national income but also on the number of people who would share it. A rise in average (i.e. per capita income) indicates that more goods and services are available on average to people. Averages helps in obtaining income per individual within a specified time frame.
answer2)))))Average income represents the total income of a country keeping in view of the total population.

If the average income is adequate to meet, the basic requirementand other facilities that country is considered developed.

More income means more of all things that human beings need. What ever people like and should have, they will be able to get with greater income.
I hope this will help you