How are inflation and unemployment measured, what causes them, and is there a trade-off between the two?
Inflation and unemployment: their measurement, types and causes, their economic costs, and the Phillips curve relationship between them in the short run and long run.
An SQA Advanced Higher Economics answer on inflation and unemployment: how each is measured, the types and causes of inflation (demand-pull and cost-push) and unemployment, their economic costs, and the Phillips curve relationship showing a short-run trade-off but a vertical long-run curve at the natural rate.
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What this key area is asking
Inflation and unemployment are two of the government's four macroeconomic aims, and Advanced Higher links them through the Phillips curve. You must explain how each is measured, distinguish the types and causes of inflation (demand-pull and cost-push) and unemployment, set out their economic costs, and analyse the Phillips curve relationship, the short-run trade-off and why the long-run curve is vertical at the natural rate. The policy punchline, that demand policy cannot buy lasting low unemployment, recurs throughout the area.
Measuring inflation and unemployment
The rate of each is what matters for policy: the UK inflation target is 2 per cent CPI, and the unemployment rate is the unemployed as a percentage of the labour force.
Types and causes of inflation
A wage-price spiral can entrench inflation: higher prices prompt higher wage demands, which raise costs and prices again.
Types and causes of unemployment
- Cyclical (demand-deficient) unemployment: caused by a fall in aggregate demand in a recession.
- Structural unemployment: a mismatch between workers' skills or location and the jobs available, as industries decline.
- Frictional unemployment: short-term, between jobs.
- Real-wage (classical) unemployment: wages held above the market-clearing level (for example by powerful unions or a minimum wage in a competitive market).
The natural rate of unemployment is the rate that remains when the labour market is in equilibrium, made up of structural and frictional unemployment.
The costs of inflation and unemployment
Costs of inflation:
- Erodes the real value of money and savings, hitting those on fixed incomes.
- Creates uncertainty, deterring investment and planning.
- Worsens international competitiveness if domestic inflation exceeds rivals', harming the current account.
- Distorts price signals; menu and shoe-leather costs. Deflation (falling prices) is also harmful, delaying spending.
Costs of unemployment:
- Wasted resources and lost output (the economy operates inside its PPD).
- Lost income and hardship for the unemployed; loss of skills (hysteresis).
- Higher welfare spending and lower tax revenue, worsening the budget.
The Phillips curve
The Phillips curve links the two: it shows an inverse relationship between inflation and unemployment.
- Short run: lower unemployment comes with higher inflation. A government could stimulate demand to cut unemployment below the natural rate, accepting higher inflation, a short-run trade-off.
- Long run: the long-run Phillips curve is vertical at the natural rate of unemployment (the NAIRU, the non-accelerating-inflation rate of unemployment). If unemployment is held below the natural rate, inflation expectations rise, the short-run curve shifts up, and unemployment returns to the natural rate at higher inflation.
The conclusion is decisive: demand policy cannot permanently lower unemployment; it only moves the economy along the short-run curve and, if pushed too far, raises inflation. To cut unemployment durably, the government must lower the natural rate through supply-side policy.
Worked example: reading the Phillips trade-off
Why this matters
Inflation and unemployment are the heart of macroeconomic policy debate, and the Phillips curve is the SQA's favourite vehicle for testing whether you understand the limits of demand management. The natural-rate idea links directly to supply-side policy and the Scottish economy topic, while the costs of each problem feed into the evaluation of fiscal and monetary policy. It is also fertile ground for the project (cost-of-living, regional unemployment).
Try this
Q1. State one cause of demand-pull inflation and one cause of cost-push inflation. [2 marks]
- Cue. Demand-pull: aggregate demand rising faster than capacity (a consumer boom). Cost-push: rising costs such as higher imported energy prices or a weaker exchange rate.
Q2. Explain why the long-run Phillips curve is vertical. [2 marks]
- Cue. Any attempt to hold unemployment below the natural rate raises inflation expectations, shifting the short-run curve up until unemployment returns to the natural rate; only inflation, not unemployment, changes in the long run.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA AH (style)10 marksDistinguish between demand-pull and cost-push inflation, and explain the economic costs of high inflation.Show worked answer →
Worth 10 marks: the two types (about 5 marks) and the costs (about 5 marks).
The types (about 5 marks). Demand-pull inflation occurs when aggregate demand grows faster than the economy's capacity to supply, so excess demand pulls prices up, typical of a boom with a positive output gap. Cost-push inflation occurs when rising costs of production (wages, imported raw materials, energy, a weaker exchange rate) push firms' prices up even without excess demand, shifting aggregate supply left.
The costs (about 5 marks). High inflation erodes the real value of money and savings, hurting those on fixed incomes; it creates uncertainty that deters investment; it can damage international competitiveness if domestic inflation exceeds rivals', worsening the current account; it distorts price signals and can trigger a wage-price spiral. Menu costs and shoe-leather costs are minor additions. A good answer notes that very low or negative inflation (deflation) is also harmful.
SQA AH (style)12 marksExplain the Phillips curve and discuss whether a government can permanently trade higher inflation for lower unemployment.Show worked answer →
Worth 12 marks: the short-run curve (about 4 marks), the long-run curve (about 5 marks) and the judgement (about 3 marks).
Short run (about 4 marks). The Phillips curve shows an inverse relationship between inflation and unemployment: lower unemployment is associated with higher inflation. Stimulating demand to cut unemployment below its equilibrium raises wage and price inflation, a short-run trade-off policymakers might exploit.
Long run (about 5 marks). The long-run Phillips curve is vertical at the natural rate of unemployment (the NAIRU). If the government tries to hold unemployment below the natural rate, workers' inflation expectations adjust upwards, the short-run curve shifts up, and unemployment returns to the natural rate but at higher inflation. So the trade-off is only temporary; in the long run there is no trade-off, only higher inflation for the same unemployment.
Judgement (about 3 marks). A government cannot permanently buy lower unemployment with higher inflation. To lower unemployment durably it must cut the natural rate through supply-side policy. Conclude that demand policy moves the economy along the short-run curve but supply-side policy is needed to shift the long-run curve left.
Related dot points
- Economic growth and the business cycle: measuring real GDP and output gaps, the phases and causes of the cycle, the distinction between actual and potential growth, and the benefits and costs of growth including sustainability.
An SQA Advanced Higher Economics answer on economic growth and the business cycle: measuring growth with real GDP, the difference between actual and potential growth, output gaps, the phases and causes of the business cycle, and a balanced evaluation of the benefits and costs of growth including sustainability.
- The aggregate demand and supply model: the components of aggregate demand, short-run and long-run aggregate supply, macroeconomic equilibrium, and the multiplier and accelerator effects of a change in spending.
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- Fiscal and monetary policy: government spending, taxation and the budget; the role of the central bank, interest rates and quantitative easing; how each affects aggregate demand; and an evaluation of their effectiveness.
An SQA Advanced Higher Economics answer on demand-side policy: fiscal policy (government spending, taxation, the budget balance and the national debt), monetary policy (the central bank, interest rates and quantitative easing), how each shifts aggregate demand, and a balanced evaluation of their effectiveness and limitations.
- Supply-side policy and the Scottish economy: market-based and interventionist supply-side measures and their effects on long-run aggregate supply, and the division of economic powers between the Scottish and UK governments under devolution and the fiscal framework.
An SQA Advanced Higher Economics answer on supply-side policy and the Scottish economy: market-based and interventionist supply-side measures and how they shift long-run aggregate supply, plus the division of devolved and reserved economic powers between the Scottish and UK governments and the Scottish fiscal framework.
- Exchange rates and the balance of payments: the structure of the balance of payments, floating and fixed exchange rate systems, how a floating rate is determined and what causes appreciation and depreciation, and the effects of a changing exchange rate on the current account.
An SQA Advanced Higher Economics answer on exchange rates and the balance of payments: the structure of the balance of payments, fixed and floating exchange rate systems, how a floating rate is determined and the causes of appreciation and depreciation, and how a changing exchange rate affects the current account, including the Marshall-Lerner condition and the J-curve.
Sources & how we know this
- Advanced Higher Economics Course Specification — SQA (Qualifications Scotland) (2024)