amazon.co.ukInflation, Unemployment and Growth
A* revision for CPI measurement, demand-pull and cost-push inflation, the Phillips curve, unemployment types, hysteresis and economic growth for AQA 7136, Edexcel A 9EC0 and OCR H460.
🎯 Learning Objectives
- Explain how CPI is constructed and evaluate its limitations as a measure of the cost of living
- Analyse the costs of inflation and deflation, including redistribution, fiscal drag and uncertainty
- Draw and shift AD/AS diagrams for demand-pull and cost-push inflation with full chains of reasoning
- Explain the short-run Phillips curve trade-off and why the long-run curve is vertical at the natural rate
- Evaluate the Phillips curve using the 1970s stagflation and the 2022–25 UK evidence
- Distinguish frictional, structural, seasonal and cyclical unemployment, and explain hysteresis
- Distinguish actual from potential growth and evaluate the UK productivity puzzle with data
📋 Key Definitions and Core Concepts
Inflation: A sustained rise in the general price level; measured in the UK by CPI with a 2% target ±1 percentage point.
CPI: Consumer price index: a weighted basket of roughly 700 goods and services tracked by the ONS to measure consumer inflation.
Demand-pull inflation: Inflation caused by excess aggregate demand shifting AD right into the capacity-constrained region of AS.
Cost-push inflation: Inflation caused by rising costs of production shifting SRAS left (energy shocks, wage claims, imported inputs, depreciation).
Phillips curve: The short-run inverse trade-off between inflation and unemployment; the long-run Phillips curve is vertical at the natural rate (no permanent trade-off).
Natural rate of unemployment (NRU/NAIRU): Frictional plus structural unemployment — the rate at which the labour market clears; only supply-side policy can lower it.
Frictional unemployment: Short-term unemployment from search and matching between jobs, caused by information gaps.
Structural unemployment: Long-term unemployment from a mismatch between workers' skills/location and available jobs, caused by industrial, technological or global change.
Cyclical (demand-deficient) unemployment: Unemployment caused by insufficient aggregate demand in a downturn; maps to the negative output gap.
Hysteresis: Cyclical unemployment becoming structural as the long-term unemployed lose skills and labour-force attachment, raising the natural rate.
Measuring inflation: CPI, RPI and the costs of inflation
Inflation is a sustained rise in the general price level; disinflation is a fall in the inflation rate; deflation is a sustained fall in the price level. CPI: the ONS surveys a basket of roughly 700 goods and services, weights each by its share of average household spending (updated annually), and tracks the price change of the weighted basket; weights are based on household expenditure surveys. RPI differs mainly by including mortgage interest payments and some housing costs, and by using an arithmetic-average formula that biases it upwards — the UK stopped using RPI as an official inflation measure in 2030-linked reforms and regulators have migrated to CPIH (CPI plus owner-occupier housing costs). Limitations of CPI (a standard data-response question): the basket is an average that misrepresents groups with different spending patterns (pensioners, renters vs owners); quality changes are imperfectly adjusted (hedonic adjustments); new products enter with a lag; and regional variation (London vs the North East) is masked.
Costs of inflation: menu costs (repricing), shoe-leather costs (holding less cash), redistribution — from savers to borrowers when inflation is unexpected, and regressive effects when prices of essentials rise; fiscal drag — unindexed tax thresholds pull taxpayers into higher bands (frozen income tax thresholds to 2028 pushed millions into higher-rate bands); reduced international competitiveness — higher relative inflation makes exports dearer; uncertainty — planned investment falls, long contracts are avoided; and menu of distortions in business planning. Costs of deflation are often worse: consumers postpone purchases expecting lower prices, debt burdens rise in real terms (debt-deflation spiral — the 1930s and the Eurozone 2014–16), and the zero lower bound blocks monetary stimulus. Data anchors: UK CPI peaked at 11.1% in October 2022 (a 41-year high), returned to the 2% target in mid-2024, then rose above 3% in 2025 driven by energy, water and administered price rises — always quote the target (2% ±1) and a real figure in data responses.
Causes of inflation: demand-pull, cost-push and expectations
Demand-pull inflation: excess aggregate demand pulling the price level up — AD shifts right into the vertical (classical LRAS) or steep (Keynesian) region of AS. Diagram description: axes price level/real output; vertical LRAS at Yf; AD1→AD2 right shift moves equilibrium up LRAS — price level rises from P1 to P2 with output unchanged (at full capacity). Causes: any AD component rising faster than AS — tax cuts, low interest rates, wealth gains, booming world demand. Cost-push inflation: rising costs shift SRAS left — oil and energy shocks, imported input costs (including a depreciation), wage settlements above productivity growth, or administered price rises (regulated energy and water tariffs). Diagram description: SRAS1→SRAS2 left shift — price level rises, real output falls (stagflation).
The monetarist view (quantity theory): MV = PQ, so with V (velocity) and Q (output) stable in the long run, sustained money-supply growth translates into sustained inflation — “inflation is always and everywhere a monetary phenomenon” (Friedman). This underpins inflation targeting: control money growth/AD and inflation follows. Wage-price spiral and expectations: higher prices trigger wage demands; higher wages raise costs and prices further — expectations-augmented inflation. Imported inflation: a depreciation raises import prices directly (input costs → SRAS left) and via pass-through to consumer prices. Real-world application (the 2021–24 UK episode — an ideal essay case): the inflation surge was both demand-pull and cost-push — pandemic fiscal and monetary stimulus (furlough ~£70bn, QE to £895bn, Bank Rate 0.1%) met supply-side constraints (energy shock after Russia's 2022 invasion of Ukraine, post-Brexit and pandemic supply frictions, labour shortages); the OBR and Bank of England judge that roughly half was imported energy shock and half excess demand. The disinflation of 2023–24 came from tightened monetary policy (Bank Rate to 5.25%), falling energy prices and easing supply chains — a chain-of-reasoning gift for evaluation paragraphs.
The Phillips curve: short-run trade-off, expectations and the long run
The short-run Phillips curve (SRPC) shows an inverse relationship between inflation and unemployment: lower unemployment (a positive output gap) is associated with higher inflation, as excess demand tightens labour markets and raises wage settlements. Diagram description: axes inflation (vertical) against unemployment (horizontal); downward-sloping SRPC; a movement along it (e.g. from 5% inflation/3% unemployment to 2%/6%) shows the trade-off; shifts of SRPC (caused by expectations or supply shocks) move the whole curve.
The expectations-augmented and long-run Phillips curve (LRPC): monetarists (Friedman, Phelps) argue the trade-off is only temporary. Workers base wage demands on expected inflation; if unemployment is pushed below the natural rate (NRU/NAIRU), actual inflation exceeds expected inflation, wages chase prices, SRPC shifts up, and unemployment returns to the NRU with higher inflation. Repeated attempts keep unemployment below NRU produce accelerating inflation. Hence the LRPC is vertical at the NRU: no permanent trade-off exists — only supply-side policy can lower the NRU. Diagram description: vertical LRPC at the natural rate (say 4%); successive SRPCs at higher expected inflation; a point moving up the vertical line shows inflation rising with unemployment stuck at NRU.
Evidence and evaluation (A* material): the 1970s stagflation (oil shocks + wage-price spirals; UK inflation 24% in 1975 with unemployment rising) shattered the simple Phillips trade-off and supported monetarism. The 2022 UK episode supports a downward-sloping but flattening SRPC: inflation hit 11.1% with unemployment only ~3.6% (a strong trade-off on the demand side), but in 2023–25 inflation fell from 11% towards 3% while unemployment rose only to ~4–4.5% — a flatter trade-off than the 1970s, consistent with better-anchored inflation expectations (independent central bank, credible target) and weaker union power. The flatter the SRPC, the more output must be sacrificed to disinflate — and the more valuable central bank credibility becomes. Judgement frame: the short-run trade-off exists but its steepness depends on expectations credibility, labour-market flexibility and whether shocks are demand-side or supply-side; the long-run curve is vertical, so the sustainable way to cut unemployment is supply-side, not demand-side.
Unemployment: measurement, types and hysteresis
Measurement: the ILO/Labour Force Survey counts as unemployed those without work, available to start and actively seeking — UK unemployment around 4–4.5% in 2024–25; the claimant count (claiming unemployment-related benefits) is cheaper to collect but understates (not all seekers claim) and overstates (some claimants are not genuinely seeking); economic inactivity (~21–22% of working-age adults — students, carers, long-term sick) sits outside both. Underemployment (workers in jobs below their skills or hours) is a further hidden measure.
Types of unemployment: frictional — search and matching time between jobs (information gaps); structural — a mismatch between workers' skills/location and available jobs, caused by industrial change, technological change and globalisation (coal, steel, textiles; regional concentration); seasonal — agriculture, tourism, retail peaks; cyclical (demand-deficient) — insufficient AD in a downturn (negative output gap). The natural rate = frictional + structural — the unemployment rate at full employment, when the labour market clears. Diagram description (cyclical unemployment): AD1 intersecting SRAS at Y1 < Yf; the output gap maps to cyclical unemployment via Okun's law (roughly: each 1% output gap ≈ 0.5% extra unemployment).
Hysteresis: cyclical unemployment becomes structural — the long-term unemployed lose skills, morale and attachment to the labour force (discouraged workers move into inactivity), and firms' capital is scrapped, so potential output falls and the natural rate rises. Evidence: the UK and much of Europe after the 1980s recessions saw persistently elevated unemployment for a decade — the key argument against letting recessions self-correct slowly (a direct criticism of the pure classical view). Costs of unemployment: lost output (the output gap itself), fiscal costs (benefits, lost tax revenue), scarring/hysteresis, social costs (crime, health), and regional divergence. Data anchors: UK unemployment peaked at ~11.9% in 1984 and ~8.5% in 2011; post-pandemic it stayed low (~3.6–4.5%) while inactivity rose — a useful nuance: low unemployment masked high inactivity, so the labour market was tighter than the headline rate suggested.
Economic growth: actual, potential, the cycle and the productivity puzzle
Actual growth is the percentage change in real GDP — driven by AD (components C, I, G, X − M moving output towards capacity). Potential growth is the growth of productive capacity — driven by AS-side factors: labour (size, skills, participation), capital investment, technology and productivity. The economic cycle: boom (positive output gap, inflationary pressure), recession (two or more quarters of falling real GDP), recovery. Diagram description: a trend line of potential output with the actual path oscillating above (booms) and below (recessions) it; alternatively the AD/AS diagram with equilibrium swinging either side of Yf. UK cycle data: output fell ~11% in 2020, rebounded strongly in 2021, then stagnated (roughly 0.3–1% growth a year in 2022–24) — a rare prolonged stagnation rather than a classic V-shaped cycle.
Causes of growth (chains): AD-driven recovery — lower rates, fiscal stimulus, export booms; potential-driven — investment in capital and infrastructure, education and training (human capital), immigration expanding the labour force (UK net migration peaked above 900,000 in 2023, easing labour shortages but straining housing and services), R&D and technological diffusion. The productivity puzzle (the UK's central growth issue): labour productivity growth has averaged under 0.5% a year since the 2008 financial crisis, versus over 2% before — the OBR judges the crisis left a permanent hole in potential output; explanations include weak business investment (post-Brexit and post-financial-crisis), regional disparities, low R&D intensity, and capital misallocation. Benefits of growth: higher living standards, employment, tax revenue (the fiscal dividend), and improved public services; costs: inflationary pressure near capacity, environmental damage (emissions rise with GDP absent decoupling), inequality if gains are unevenly shared, and balance-of-payments pressure as imports rise. Evaluation frame: distinguish actual from potential growth in every answer — demand-side policy can close an output gap but cannot raise the trend; only supply-side policy raises potential growth, and it works with long lags (see the Policy topic). The UK's stagnation since 2022 illustrates both: demand support stabilised employment, but trend growth requires the supply side.
💡 Worked Example
Exam-style: Using the data and your economic knowledge, assess the causes of the rise in UK inflation to 11.1% in October 2022, and evaluate how the trade-off between inflation and unemployment changed as inflation fell in 2023–25. (AQA 7136 Paper 2 data-response style, 25 marks)
Mark-scheme logic: Mark logic: [AO1] define demand-pull and cost-push inflation; [AO2] apply to the data with a diagram; [AO3] analyse with chains and the Phillips curve; [AO4] evaluate the trade-off with evidence and a justified judgement. [AO1/AO2] Inflation is a sustained rise in the general price level. The 2022 peak of 11.1% (a 41-year high) had both causes. Cost-push: Russia's invasion of Ukraine (Feb 2022) drove energy and food prices up sharply; import costs shifted SRAS left — higher price level, lower output (stagflation risk). Regulated tariffs (the energy price guarantee capped bills at £2,500 but did not remove the shock) fed directly into CPI. Demand-pull: pandemic stimulus (furlough ~£70bn, QE taking the Bank's balance sheet to £895bn, Bank Rate 0.1%) left excess demand meeting constrained supply — a positive output gap component. [AO3] The Phillips curve frame: the tight post-pandemic labour market (unemployment ~3.6%) with 11% inflation is consistent with an upward movement along (or a shift of) the SRPC; wage demands chasing prices threatened a wage-price spiral (second-round effects). [AO4] Evaluation — the trade-off in 2023–25: monetary tightening (Bank Rate to 5.25% by August 2023) and falling energy prices brought inflation back to 2% in mid-2024, but unemployment rose only slightly (~4–4.5%) — a much flatter SRPC than the 1970s (inflation 24% in 1975 with unemployment then doubling). Explanations: inflation expectations better anchored by an independent, credible central bank; weaker trade-union power; lower pass-through of costs. But the trade-off was not abolished: disinflation coincided with sluggish growth and rising unemployment from 2023, and inflation re-accelerated above 3% in 2025 on administered price rises — showing supply shocks re-shift SRAS regardless of demand policy. Judgement: the 2022 episode was a mixed cost-push/demand-pull shock; the fall in the inflation–unemployment trade-off's steepness since the 1970s reflects anchored expectations and labour-market flexibility, but supply-side shocks still force a choice between accepting inflation or sacrificing output.
❓ Practice Questions & Mark Schemes
Explain two limitations of the CPI as a measure of the cost of living, using examples.
Answer: Limitation 1 — the basket is an average: weights reflect mean household spending, misrepresenting groups with different patterns — pensioners (more energy and food, whose prices surged in 2022) or renters vs owner-occupiers face different effective inflation; regional variation (London vs North East housing costs) is masked. Limitation 2 — quality adjustment and new products: hedonic adjustments for improving goods (phones, laptops) understate effective inflation for consumers who value the old version; new products enter the basket with a lag, so early price falls are missed. Extension: RPI includes mortgage interest payments, so it moves with interest-rate changes (circular — rate rises to fight inflation raise RPI), which is why CPIH became the lead measure. In data responses, always link the limitation to a number or group.
Using an AD/AS diagram, analyse how a depreciation of sterling could cause inflation, and evaluate the likely size of the effect.
Answer: A depreciation raises the price of imported inputs (energy, food, components) and finished goods. Input costs rise → SRAS shifts left: price level rises, output falls (cost-push). Pass-through: import prices feed directly into CPI via the basket (imported inflation); AD may also rise if exports become more competitive (Marshall–Lerner), compounding the price rise. Evaluation: the size depends on (1) the share of imports in the CPI basket and in firms' inputs (the UK is import-intensive — food ~46% imported, energy partly priced in dollars); (2) the elasticity of demand for exports and imports (Marshall–Lerner — whether net exports actually rise); (3) the persistence of the depreciation — the post-referendum 2016 fall of ~10–15% added roughly 1–2 percentage points to CPI over 2017 (estimates vary); (4) whether the Bank of England looks through a temporary shock or acts. Judgement: a depreciation is reliably inflationary for an open, import-intensive economy, but the pass-through size depends on elasticities and the persistence of the currency move.
Explain the difference between the short-run and long-run Phillips curve, and evaluate the monetarist claim that there is no permanent trade-off between inflation and unemployment.
Answer: SRPC: downward-sloping — lower unemployment (positive output gap) ↔ higher inflation, as tight labour markets raise wage settlements. LRPC: vertical at the natural rate (frictional + structural) — attempts to hold unemployment below NRU raise expected inflation, shift SRPC up, and unemployment returns to NRU with higher inflation (accelerating if repeated). Only supply-side policy lowers NRU. Evaluation of monetarism: supporting evidence — 1970s stagflation (UK inflation 24% in 1975 with rising unemployment) destroyed the simple trade-off; repeated stimulus near capacity produced inflation without durable employment gains. Countervailing evidence — trade-offs did appear: 2022 UK inflation 11.1% with unemployment ~3.6%, and disinflation 2023–25 cost growth and some jobs — a short-run trade-off clearly operated; hysteresis may make the long-run curve not fully vertical (long-term unemployment can raise NRU permanently, and demand policy can sometimes lower it by preventing scarring). Judgement: the monetarist claim is broadly accepted for the long run — sustained sub-NRU unemployment is not achievable — but the short-run trade-off is real, and its steepness depends on credibility, expectations and labour-market flexibility.
Distinguish between frictional, structural and cyclical unemployment, and explain one policy appropriate to each.
Answer: Frictional: search/matching time between jobs (information gaps). Policy: improve job matching — job centres, online platforms, better information; low-cost, short-term. Structural: skills/location mismatch from industrial change (coal, steel) or technology. Policy: supply-side — retraining, education, relocation subsidies, regional investment (levelling-up); slow but durable. Cyclical: insufficient AD in a downturn (negative output gap). Policy: expansionary fiscal/monetary policy shifting AD right; fast but raises debt/risk of inflation if the gap is mis-estimated. Extension: the natural rate = frictional + structural — so policy cannot sustainably cut unemployment below it via demand management. Judgement: match the policy to the type — treating structural unemployment with demand stimulus produces inflation, not jobs; treating cyclical with retraining wastes a downturn's urgency.
Explain hysteresis and evaluate its implications for how governments should respond to recessions.
Answer: Hysteresis: cyclical unemployment becomes structural — the long-term unemployed lose skills, morale and labour-force attachment (discouraged workers exit into inactivity), firms scrap capital and cut R&D, so potential output falls and NRU rises. Implications: recessions are not self-correcting costlessly — delaying stimulus risks permanent scarring, so the case for aggressive, fast demand stimulus (and furlough-style job protection) strengthens; the UK's furlough scheme (CJRS, ~£70bn) in 2020–21 is the textbook example — it suppressed the rise in unemployment that would have occurred, limiting hysteresis. Evidence: the 1980s UK recessions left unemployment elevated for a decade (peak ~11.9% in 1984) — long-run scarring; the 2008 crisis left permanent potential-output damage (OBR estimate). Evaluation: aggressive stimulus has its own costs (debt, inflation near capacity — the 2021–22 aftermath); job-retention schemes can preserve zombie firms/jobs that would otherwise reallocate. Judgement: hysteresis argues for prompt, targeted demand support in recessions — the cost of delay exceeds the cost of stimulus — while accepting that supply-side reallocation of genuinely obsolete jobs should still occur.
Using the data and your knowledge, assess whether the UK's growth record since 2022 supports the view that demand-side policy alone can deliver sustained growth.
Answer: The record: real GDP fell ~11% in 2020, recovered by 2022, then grew only ~0.3–1% a year in 2022–24; unemployment stayed low (~4–4.5%) while inactivity remained elevated (~21–22%); productivity growth has averaged under 0.5% a year since 2008. Assessment: demand-side policy (rate cuts from August 2024, fiscal support) stabilised employment and supported consumption — actual output was sustained — but growth remained far below the pre-2008 trend of 2–2.5%, and potential growth is OBR-estimated near 1.5%. The distinction: demand policy closes an output gap but cannot raise the trend — only supply-side factors (investment, skills, labour force participation, R&D) shift LRAS. The UK's stagnation reflects structural issues: weak business investment (post-Brexit, post-financial-crisis), regional disparities, low R&D intensity. Judgement: the evidence does not support demand-side-only growth — it delivered stability, not sustained growth; sustained growth requires supply-side reform (education, infrastructure, planning, investment incentives) combined with stable demand management. Counterpoint: without adequate demand, supply-side capacity goes unused — the two are complements, not substitutes.