A developing country recorded the following data: GNP = ₦1,200 billion; Net Factor Income from Abroad = −₦200 billion; Depreciation = ₦150 billion. What is the Net National Product (NNP) at market prices?

Net National Product (NNP) at market prices is derived by subtracting depreciation (Capital Consumption Allowance) from GNP. NNP = GNP − Depreciation = ₦1,200bn − ₦150bn = ₦1,050bn. The Net Factor Income from Abroad is already incorporated in GNP (GNP = GDP + Net Factor Income from Abroad), so it is not deducted again when calculating NNP from GNP.