Choosing policies and evaluating macroeconomic outcomes
Choosing policies and evaluating macroeconomic outcomes: build the core model, apply it to evidence and qualify conclusions where outcomes depend on context.
9708 section 10.3; A Level. Checked against Cambridge's 2026–2028 Version 2 (latest version published December 2025) and 2029 Version 1 (published September 2026). Cambridge states that neither version has significant changes affecting teaching. Always follow the syllabus for the candidate's examination year.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What does a Laffer curve show?
What you will learn
- Evaluate fiscal, monetary, supply-side, exchange-rate and trade policies, including Laffer analysis
- Analyse conflicts created by policy outcomes
- Explain government failure in macroeconomic policy
Core model and terms
Fiscal policy changes taxes and spending; monetary policy influences interest rates, credit and money conditions. Supply-side policies may use market incentives or public intervention to increase capacity. Exchange-rate policy and international trade policy affect external demand, import costs and competitiveness. A Laffer curve illustrates that tax revenue can first rise and later fall as a tax rate changes, but the curve does not identify a universal revenue-maximising rate or prove that a tax cut will raise revenue in a particular economy.
Apply and evaluate
Policy effectiveness depends on the diagnosed problem, the time horizon, expectations, spare capacity, implementation and external conditions. A measure may improve one objective while worsening another—for example, demand restraint can lower inflation but reduce growth and employment. Macroeconomic government failure can follow inaccurate forecasts, lags, political incentives, inconsistent instruments or unintended responses. Compare alternatives, state assumptions and assess who gains or bears the costs.
Pause and explain
Which statement best applies choosing policies and evaluating macroeconomic outcomes?
Worked example
A tax rate rises while measured tax revenue falls. What may a Laffer-curve argument suggest, and what further evidence is needed before recommending a tax cut?
Show the worked solution
- Revenue can fall at a sufficiently high rate if the tax base or compliance responds strongly
- The observation alone does not locate a revenue-maximising rate
- Estimate behavioural responses, the tax base, distribution and fiscal effects before choosing a rate
Answer Revenue can fall at a sufficiently high rate if the tax base or compliance responds strongly → The observation alone does not locate a revenue-maximising rate → Estimate behavioural responses, the tax base, distribution and fiscal effects before choosing a rate
Try a topic test
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A tax rate rises while measured tax revenue falls. What may a Laffer-curve argument suggest, and what further evidence is needed before recommending a tax cut?
Give me a hint
Explain the possible rate–revenue relationship without treating the curve as a measured policy rule.
Compare my reasoning
- Revenue can fall at a sufficiently high rate if the tax base or compliance responds strongly
- The observation alone does not locate a revenue-maximising rate
- Estimate behavioural responses, the tax base, distribution and fiscal effects before choosing a rate
Revenue can fall at a sufficiently high rate if the tax base or compliance responds strongly The observation alone does not locate a revenue-maximising rate Estimate behavioural responses, the tax base, distribution and fiscal effects before choosing a rate
Look for these in your work
- Revenue can fall at a sufficiently high rate if the tax base or compliance responds strongly
- The observation alone does not locate a revenue-maximising rate
- Estimate behavioural responses, the tax base, distribution and fiscal effects before choosing a rate
Inflation is high after a supply shock. Compare one likely effect of raising interest rates with one limitation.
Give me a hint
Trace demand restraint and then return to the original supply-side cause.
Compare my reasoning
- Higher rates can reduce interest-sensitive spending and demand pressure
- They do not directly restore the disrupted supply
- Output and employment may weaken while the shock persists
Higher rates can reduce interest-sensitive spending and demand pressure They do not directly restore the disrupted supply Output and employment may weaken while the shock persists
Look for these in your work
- Higher rates can reduce interest-sensitive spending and demand pressure
- They do not directly restore the disrupted supply
- Output and employment may weaken while the shock persists
A government wants both faster growth and lower emissions. Give one policy combination and one conflict to assess.
Give me a hint
Pair a capacity or innovation measure with an environmental incentive.
Compare my reasoning
- Clean infrastructure investment can raise capacity while supporting lower-emission production
- Taxpayers bear near-term costs and projects may displace other spending
- Measure emissions and distributional effects over time
Clean infrastructure investment can raise capacity while supporting lower-emission production Taxpayers bear near-term costs and projects may displace other spending Measure emissions and distributional effects over time
Look for these in your work
- Clean infrastructure investment can raise capacity while supporting lower-emission production
- Taxpayers bear near-term costs and projects may displace other spending
- Measure emissions and distributional effects over time
A poorly timed stimulus is introduced after the economy has returned to capacity. Explain one possible government-failure consequence.
Give me a hint
Consider policy lags and the position of output when the measure takes effect.
Compare my reasoning
- The policy may arrive after spare capacity has closed
- Extra demand can intensify inflation rather than raise sustainable output
- Forecast error and implementation lags can worsen the original policy choice
The policy may arrive after spare capacity has closed Extra demand can intensify inflation rather than raise sustainable output Forecast error and implementation lags can worsen the original policy choice
Look for these in your work
- The policy may arrive after spare capacity has closed
- Extra demand can intensify inflation rather than raise sustainable output
- Forecast error and implementation lags can worsen the original policy choice
Common mistakes
- Treating policy trade-offs as fixed or presenting the Laffer curve as proof that a specific tax cut will pay for itself.
What can you explain now?
What does a Laffer curve show?
Compare with the explanation
Tax revenue may rise and then fall as the tax rate changes
The curve illustrates a possible behavioural relationship, not a universal optimal rate.
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Make it stick
Before moving on, explain the central idea in choosing policies and evaluating macroeconomic outcomes and state one condition that could change its effect.
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