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8 May, 2015 - 11:08

National income (NI) is equal to net national product minus indirect business taxes:

NI = NNP - (ind business taxes)

National income is also equal to the sum of salaries, rent, interest, profit and proprietors' income.

National income is the sum of all forms of gross income, similar to the gross salary appearing in a paycheck of an employee, that is before various taxes and other deductions are taken out.