The increase in working population of a country would result in the increase of national income and GDP of the country
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I dont think there is anything to describe its just a fact that more people more income....for example in a family there are 4 people and only one of them is earning witb a salary of 10,000 so there are only 10,000 for expenditure of 4 people ..... but if two of them would be earning each of 10,000 salary then there will be 20,000 for the expenditure of 4 people. Hence More people more income.
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