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← Economics notes
Edexcel ·Economics·Cambridge AS & A Level Economics

The Macroeconomy: National Income & AD/AS

14 min read

Measuring national income, the circular flow, GDP and GNI, real versus nominal, and an introduction to aggregate demand and supply.

The circular flow of income

In a simple economy, households supply factors to firms and receive income; firms produce output that households buy. The flow of income equals the flow of output equals the flow of expenditure. Injections (investment, government spending, exports) add to the flow; withdrawals/leakages (saving, taxation, imports) take out of it. The economy is in equilibrium when injections = withdrawals (J = W).

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