How is national income computed from the expenditure approach?

National income is computed from the expenditure approach by summing up all expenditures made in an economy over a specific period. This includes consumption by households, investments by businesses, government spending on goods and services, and net exports (exports minus imports). The formula can be expressed as: National Income = C + I + G + (X - M), where C is consumption, I is investment, G is government spending, X is exports, and M is imports. This approach reflects the total economic activity and the flow of money within the economy.