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8 May, 2015 - 11:05

GDP can be calculated as the sum of all expenditures: personal consumption expenditure (C), gross private domestic investment (Ig), government purchases (G), and net exports (Xn).

GDP = C + Ig + G + Xn.

The expenditure approach sums all that is purchased: in a sense, it is equivalent to the income approach because purchases are only possible if income is present.