Unit 4 · The Macroeconomy (AS & A Level)

What Cambridge International AS & A Level Economics (9708) Unit 4 covers

Use this map to connect each assessed skill to the relationship or representation that makes it visible.

The Macroeconomy

Connect the published share to the unit model

The vocabulary spine is gross domestic product, gross national income, net national income, aggregate demand, aggregate supply, economic growth, unemployment, inflation, deflation, consumer price index. Revise them through national output, aggregate demand, aggregate supply, inflation, and unemployment: define the relationship, identify what changes, and keep the comparison needed for the confidence-led AD shift during recall.

The AD–SRAS graph keeps real GDP on the horizontal axis and the price level on the vertical axis. Stronger household confidence moves AD1 to AD2 while SRAS stays fixed.

The decision that organizes this unit

Define the system and choose the route before calculating

With AD1 given by PL=100−Y and SRAS by PL=Y, the initial solution is Y=50 and PL=50.

Mechanism route and repair branches

Relationships to preserve

• The accounting identity organizes aggregate demand into consumption, investment, government spending, exports, and imports.
• Do not describe the move from E1 to E2 as economic growth without noting the short-run model and the unchanged productive capacity.
• CPI inflation and the unemployment rate have different denominators.
• Keep the injection and multiplied outcome distinct: firms add 8 billion of investment, but equilibrium income rises by 32 billion.
• When taxes and imports are admitted, add MPS, MRT, and MPM in the leakage denominator.
• Money and growth concepts require separate models.

Representations to read

• Real GDP and Price level graph
• AD1, AD2, SRAS labels
• Real GDP is horizontal and Price level is vertical.
• National income and Planned expenditure graph
• 45° line, AE1, AE2 labels
• National income is horizontal and Planned expenditure is vertical.

Branches to reject

• Domestic production can be confused with residents’ income.
• A price-level change can be mistaken for more output.
• A shift is different from movement caused by the price level.
• The initial spending change can be confused with the total income change.
• MPC belongs inside 1−MPC in the simple formula.
• The 45° line and AE curve play different roles.

How Cambridge International AS & A Level Economics (9708) assesses The Macroeconomy (AS & A Level)

What a complete response must make visible

Match the task to evidence that a reader can audit, then check the most likely reasoning failure before finalizing the response.

AS macro measures: draw and solve the model

Read each question as it appears on the exam paper, choose your answer, then tap it to see the feedback.

Practice 1: Consumer confidence and short-run equilibrium

Practice 2: Calculating the unemployment rate

Key terms for Unit 4: The Macroeconomy (AS & A Level)

Models, uses, and boundaries

Aggregate demand

Aggregate demand adds consumption, investment, government spending, and net exports. Aggregate demand adds consumption, investment, government spending, and net exports. Imports are subtracted because that spending falls on foreign output.

Real growth

Real growth compares the change in real GDP with the initial real GDP and multiplies by 100. Real growth compares the change in real GDP with the initial real GDP and multiplies by 100. Nominal GDP does not belong in this calculation.

The unemployment rate

The unemployment rate divides unemployed people by the labor force. The unemployment rate divides unemployed people by the labor force. Someone outside the labor force is not added to the numerator.

Inflation

Inflation compares the CPI change with the initial CPI and multiplies by 100. Inflation compares the CPI change with the initial CPI and multiplies by 100. The second CPI is never used as the percentage base.

The simple multiplier

The simple multiplier is one divided by one minus MPC. The simple multiplier is one divided by one minus MPC. With MPC=0.75, the denominator is 0.25 and k equals 4.

With saving, taxation, and imports, the multiplier denominator

With saving, taxation, and imports, the multiplier denominator is MPS+MRT+MPM. With saving, taxation, and imports, the multiplier denominator is MPS+MRT+MPM. Every listed leakage reduces the multiplied response.

The change in income

The change in income equals the multiplier times the autonomous-demand change. The change in income equals the multiplier times the autonomous-demand change. Here 4×8 billion produces 32 billion.

The quantity equation

The quantity equation links money supply and velocity with the price level and transactions. The quantity equation links money supply and velocity with the price level and transactions. Interpret a change only after stating which other terms are held constant.

Cambridge International AS & A Level Economics (9708) Unit 4 FAQ

Evidence workshop

Continue from the free model into complete practice

The full unit guide continues with the chapter’s worked examples, figures, scoring tables, and answer checks.

• AS macro measures: connect direction and magnitude
• AS macro measures: draw and solve the model
• AS macro measures: build the argument
• The Macroeconomy: connect the model

Related Cambridge International AS & A Level Economics (9708) unit guides

How to study Cambridge International AS & A Level Economics (9708) Unit 4

Start with the organizing decision

Before solving, restate the decision in operational terms: The AD–SRAS graph keeps real GDP on the horizontal axis and the price level on the vertical axis.. Your first written move should be to With AD1 given by PL=100−Y and SRAS by PL=Y, the initial solution is Y=50 and PL=50..

Practice the same idea in several representations

Rotate through Real GDP and Price level graph, AD1, AD2, SRAS labels, Real GDP is horizontal and Price level is vertical., National income and Planned expenditure graph, 45° line, AE1, AE2 labels, National income is horizontal and Planned expenditure is vertical.. Use each representation to practice National Income Statistics, Introduction to the Circular Flow of Income, Aggregate Demand and Aggregate Supply Analysis, Economic Growth: Meaning, Measurement, Causes and Consequences, Unemployment: Measures, Types, Causes and Consequences, Price Stability: Inflation, Deflation and Their Measurement, The Circular Flow of Income: the Multiplier, Components of Aggregate Demand and Equilibrium National Income (A Level), Economic Growth and Sustainability: Output Gaps and the Business Cycle (A Level), Employment and Unemployment: the Natural Rate, Mobility of Labor and Policies (A Level), Money and Banking: Money Supply, the Quantity Theory and Commercial Banks (A Level), and explain what stays invariant when the surface form changes.

Turn each error into a repair check

After every attempt, audit the response for Domestic production can be confused with residents’ income.; A price-level change can be mistaken for more output.; A shift is different from movement caused by the price level.; The initial spending change can be confused with the total income change.; MPC belongs inside 1−MPC in the simple formula.; The 45° line and AE curve play different roles.. Then redo only the first step that made the reasoning diverge, keeping units, direction, and model conditions visible.

Confirm current course details in the official Cambridge International syllabus for the 2026-2028 administration.

Where to go next

Return to the Cambridge International AS & A Level Economics (9708) to see every unit and plan your revision.