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4.3.1 definition of Aggregate Demand (AD)

4.3.1 definition of Aggregate Demand (AD)

Aggregate Demand Defined

Definition

Aggregate demand (AD): the total planned spending on a country's goods and services at each average price level over a period of time.

Unpacking the Definition

  1. AD adds up the planned spending of every buyer in the whole economy at each average price level.
  2. The word planned means intended spending, not spending that has already taken place.
  3. It is measured over a period of time, so AD is a flow, not a stock.
  4. It is measured at each average price level, which is why AD can be plotted against the price level.
Key Idea
  • AD is the demand side of the AD–AS model of the whole economy.
  • Consumption (C) is normally the largest single component in most economies.

The Four Components

Aggregate demand:

AD=C+I+G+(X−M) AD = C + I + G + (X - M) AD=C+I+G+(X−M)
  1. Consumption (C) is household spending on goods and services, normally the largest component.
  2. Investment (I) is firms' spending on capital goods such as machinery and buildings.
  3. Government spending (G) is state spending on goods and services such as schools and roads.
  4. Net exports (X − M) are exports minus imports, which can be positive or negative.
Example
  • At one average price level, households plan consumption, firms plan investment, the government plans spending, and foreign buyers plan to buy exports.
  • Add C, I and G to get planned domestic spending, then add exports and subtract imports because imports are spending on foreign output.
  • The resulting figure is AD at that price level; because it is planned spending, realised spending may differ if plans are not carried out.

AD Versus Market Demand

  1. AD adds up planned spending across every market in the economy, so it is a macroeconomic total.
  2. The demand curve for a single good is a microeconomic idea; a change in one good's price need not change AD.
Exam technique
  • State that AD is total planned spending at each average price level.
  • List all four components and never omit net exports.
Common Mistake
  • Do not confuse aggregate demand with the demand for a single good.
  • Do not leave a component out of the definition.
Self review
  • Define aggregate demand.
  • What does 'planned' expenditure mean?
  • List the four components of AD.
  • How are net exports calculated?
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Aggregate demand (AD) is the total planned spending on a country's goods and services at each average price level over a period of time. It is the demand side of the AD-AS model for the whole economy.

The word planned means intended spending, rather than spending that has already taken place. Since AD is measured over a period of time, it is a flow rather than a stock.

AD is measured at each average price level, which allows it to be plotted against the average price level. It is a macroeconomic total, not the demand for one individual product.

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Aggregate demand (AD) is the [     ] on a country's goods and services at each average price level over a period of time.

4.3.1 definition of Aggregate Demand (AD) Revision Guide

  1. Intl A Level
  2. /Economics
  3. /4.3.1 definition of Aggregate Demand (AD)

Revision notes for CIE Intl A Level Economics 4.3.1 definition of Aggregate Demand (AD): explanations and worked examples.