Inflation Causes — Topic Master Brief

#Pearson Edexcel IAL Economics WEC12/01

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#PROBABILITY ASSESSMENT

Probability: ⚪ LOW as standalone 20-marker — appeared Jan 2024 Q14 (Turkey)

However this content is essential foundation for all monetary policy and supply-side essays. Every evaluation of monetary policy requires understanding whether inflation is demand-pull or cost-push — and using the correct characterisation in the "only if" condition. This brief is the mechanism engine for:

• T3-11 Monetary Policy (the "demand-pull vs cost-push" condition)
• T3-12 Inflation Costs (the cause determines the cost)
• T3-22/T3-23 Exemplars (the "only if" evaluation in both)

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#THE CRITICAL DISTINCTION

Demand-pull inflation: Excess aggregate demand relative to productive capacity → positive output gap → firms raise prices as demand exceeds supply → CPI rises.

Cost-push inflation: Rising input costs (energy, wages, raw materials) shift SRAS leftward → price level rises AND real output falls simultaneously → stagflation.

Why this distinction matters for marks:

• Monetary tightening (rate rises) compresses AD → reduces demand-pull ✓ but does not shift SRAS rightward → does not address cost-push ✗
• A student who evaluates monetary policy without using this distinction cannot reach Level 3 evaluation
• The "demand-pull dominant" condition appears in the mark scheme for Jan 2026, Jan 2024, and Oct 2023 as a Pearson-confirmed evaluation point

The policy prescription follows the cause:

• Demand-pull → monetary tightening, fiscal restraint
• Cost-push → supply-side intervention, wait for supply shock to resolve, energy diversification

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#SPEC COVERAGE

Specification 2.3.6: Inflation — causes and effects

• Demand-pull: AD > AS at full employment
• Cost-push: SRAS shifts leftward due to rising input costs
• Built-in / wage-price spiral
• Imported inflation through exchange rate

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#PEARSON-VERIFIED KAA POINTS

From Jan 2024 Q14 (Turkey — inflation causes):

• Energy price shock: Turkey dependent on imported energy; global commodity price rises 2022 → SRAS leftward → stagflation
• Currency depreciation: Turkish lira depreciating ~40% in 2021 → import prices rise → SRAS leftward + demand-pull from higher nominal wages
• Wage-price spiral: workers demand higher nominal wages to maintain real purchasing power → firms raise prices to cover higher unit labour costs → self-reinforcing
• Demand-pull: low interest rates and government spending maintaining high AD above productive capacity

From Oct 2023 Q12e (China — reflationary policy context):

• Chinese inflation subdued → cost-push eased, demand-pull below target → rate cut appropriate
• PBoC cut rates as demand-pull pressure below target

From Jan 2026 Q14 (Egypt — monetary policy to control inflation):

• Egypt inflation driven by combination: Egyptian pound −35% depreciation (2023) → import cost-push; AND domestic demand pressures → demand-pull
• Rate rise at 27.25% addresses demand-pull component but not cost-push exchange rate component
• This is the confirmed past-paper evaluation of cost-push limitations

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#TWO DEPLOYABLE KAA CHAINS — STAGES 1–5

#CHAIN 1: DEMAND-PULL MECHANISM — EXCESS AD AT FULL EMPLOYMENT

Stage 1: Demand-pull inflation arises when aggregate demand (AD) exceeds the economy's productive capacity at the full employment level of output — generating a positive output gap where actual output presses against the LRAS ceiling, incentivising firms to raise prices as they cannot expand output further given fixed productive capacity.

Stage 2: The UK's labour market tightening to 3.5% unemployment in December 2022 — below the estimated NAIRU of approximately 4.5% — created the demand-pull conditions that contributed to CPI reaching 11.1% in October 2022: with the economy operating above full employment, firms faced labour shortages that drove wage growth above 6% annually, simultaneously raising consumer purchasing power (demand-pull) and unit labour costs (cost-push), creating a compounding inflationary spiral.

Stage 3: As aggregate demand exceeded productive capacity — the positive output gap confirmed by below-NAIRU unemployment — firms facing excess demand for their products raised prices to ration scarce output and recover rising unit costs. The wage-price spiral amplified the initial demand-pull pressure: higher wages increased household purchasing power and therefore consumer demand, while simultaneously raising the unit labour costs that firms passed through to output prices, perpetuating the inflationary pressure beyond the initial demand shock.

Stage 4: The demand-pull CPI acceleration from approximately 0.7% in early 2021 to 11.1% in October 2022 — compressing real household purchasing power by approximately 10 percentage points in 18 months — reduced living standards for workers on fixed nominal incomes and eroded the real value of savings, while simultaneously generating the conditions for the Bank of England's 14-rise tightening cycle that compressed AD back below full employment, reducing demand-pull inflationary pressure at the cost of real output growth and employment.

Stage 5: The demand-pull mechanism is the component of inflation that monetary policy can directly address — rate rises compress AD, closing the positive output gap and removing the demand-pull pressure on prices. However, this holds only if demand-pull forces constitute the primary driver: if cost-push supply shocks dominate (as the Russia-Ukraine energy price surge also contributed to UK CPI in 2022), monetary tightening compresses demand without addressing the SRAS origin of inflation, potentially producing stagflation rather than disinflation as the policy objective.

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#CHAIN 2: COST-PUSH MECHANISM — SRAS SHIFTS LEFTWARD (STAGFLATION RISK)

Stage 1: Cost-push inflation arises when rising factor input costs — energy prices, imported raw materials, wage costs above productivity growth — shift the short-run aggregate supply curve (SRAS) leftward, simultaneously raising the general price level and reducing real output below the prior trajectory, producing the distinctively damaging combination of higher inflation and lower growth known as stagflation.

Stage 2: Russia's invasion of Ukraine in February 2022 triggered a global energy price surge that shifted SRAS leftward in energy-importing economies: UK natural gas prices rose approximately five-fold between 2021 and 2022, directly raising the production and heating costs of UK firms across all sectors, feeding into rising output prices throughout the supply chain and contributing to the CPI acceleration that exceeded 11% by October 2022.

Stage 3: As the energy cost shock raised unit production costs throughout the UK economy — increasing the cost of powering factories, transporting goods, and heating retail premises — SRAS shifted leftward from SRAS₁ toward SRAS₂: the price level rose at every output level simultaneously, while the higher costs reduced firms' willingness to supply output at existing prices, compressing real output and employment as firms reduced production volumes to maintain margins.

Stage 4: The stagflationary outcome — CPI rising to 11.1% simultaneously with real wage growth turning negative (real wages falling as nominal wages lagged CPI) — imposed the most damaging form of macroeconomic deterioration: households faced both higher prices and lower real incomes simultaneously, a combination that monetary tightening could not straightforwardly resolve because rate rises that compressed demand to reduce the price level would simultaneously worsen the already-contracting real output position.

Stage 5: The cost-push channel is the more significant cause of the UK's 2022 CPI peak because it operated independently of domestic demand conditions — the energy price shock transmitted through supply chains regardless of whether consumer demand was excessive, meaning the inflation occurred even as real wages and consumer spending growth moderated. However, the distinction matters for policy prescription: cost-push inflation that originates from global commodity price shocks resolves when the commodity price normalises (as UK gas prices did in 2023), without requiring sustained monetary tightening; demand-pull inflation requires AD compression to resolve, making the source identification critical for optimal policy sequencing.

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#THREE EVALUATION MOVES

#TYPE 1 — POLICY DIAGNOSIS LIMITATION

"However, the appropriate policy response to inflation depends critically on correctly identifying the source — demand-pull versus cost-push — which real-time policymakers cannot perfectly observe. UK CPI at 11.1% reflected both the post-Covid demand surge (demand-pull: unemployment at 3.5%, wage growth 6%+) and the Russia-Ukraine energy shock (cost-push: gas prices five-fold), creating a mixed inflation episode where demand-side tightening addressed one component but not the other. The Bank of England's rate cycle reduced demand-pull pressure successfully — CPI fell to 4.0% by December 2023 — but the energy cost-push component resolved through global commodity price normalisation rather than monetary transmission. This diagnostic challenge holds only if inflation is a mixed episode; pure demand-pull or pure cost-push cases have unambiguous policy prescriptions."

#TYPE 1 — WAGE-PRICE SPIRAL AS AMPLIFIER

"Furthermore, the demand-pull and cost-push mechanisms interact through the wage-price spiral: cost-push inflation (from energy prices) raises the CPI, prompting workers to demand nominal wage increases to maintain real purchasing power. As wages rise above productivity growth, unit labour costs increase — shifting SRAS further leftward and adding a wage-cost-push component to the original supply shock. This amplifying mechanism converts a temporary supply shock into sustained inflation even after the initial shock resolves. This holds only if workers have sufficient bargaining power to achieve above-inflation wage settlements; in labour markets with weak bargaining power (low unionisation, high unemployment), the wage-price spiral is less likely to perpetuate inflation beyond the initial shock."

#TYPE 2 — DEMAND-PULL VS COST-PUSH COMPARISON

"On balance, cost-push inflation from the energy price shock was the primary driver of the UK's 2022 CPI peak above 10% — because the demand-pull component alone (wage growth 6%, unemployment 3.5%) would not have generated double-digit CPI without the SRAS amplification from energy costs. The post-2022 disinflation confirms this: CPI fell sharply to 4.0% by December 2023 as global energy prices normalised, substantially faster than monetary transmission alone would produce. This assessment holds only if the energy price normalisation is the primary disinflation driver; if demand-pull compression from the 14-rate-rise cycle was the dominant mechanism, the disinflation speed would confirm monetary policy as primary — which the 12–18 month lag and the timing of commodity price falls make difficult to disentangle."

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#THREE CONDITIONAL JUDGEMENT TEMPLATES

Template 1 — "Evaluate causes of inflation" (Jan 2024 framing): "Overall, cost-push inflation from external supply shocks (energy price surges, currency depreciation) was the primary driver of Turkey's 2022–2023 CPI acceleration rather than excess domestic demand — because the Turkish lira's depreciation of approximately 40% in 2021 raised the domestic cost of imported inputs before domestic demand overheating could independently generate double-digit inflation. This assessment holds only if Turkey's demand conditions were not independently driving above-capacity output; if strong domestic demand was simultaneously generating a positive output gap, both mechanisms were operating and the cost-push characterisation is only partial. However, the policy implication is clear regardless: addressing cost-push inflation requires exchange rate stabilisation (rate rises to reduce capital outflows) and supply-side energy diversification, not just demand compression."

Template 2 — Inflation causes as evaluation in monetary policy essays: "This monetary tightening mechanism controls inflation only if the dominant cause is demand-pull — if cost-push forces from supply shocks account for the majority of the CPI acceleration, rate rises compress demand without addressing the SRAS origin, risking stagflation as real output falls while the price level remains elevated."

Template 3 — Mixed inflation episode: "The UK's inflation episode illustrates the most challenging monetary policy scenario: mixed demand-pull and cost-push pressures operating simultaneously. The demand-pull component required rate rises; the cost-push component required either supply-side intervention or patience for commodity prices to normalise. The rate rises successfully addressed the demand-pull element — confirmed by the 7.1pp CPI fall from peak — while the energy cost-push resolved through global market normalisation. The interaction of both required a policy mix rather than monetary policy alone."

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#COUNTRY DATA BANK

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#DIAGRAM

Cost-push inflation — SRAS shifts LEFT:

P₂ ---- New equilibrium (higher P, lower Y)
P₁ ---- Original equilibrium

SRAS₂ (left of SRAS₁)
SRAS₁

AD (unchanged)

Y₂  Y₁        → Real output

Key: Both P rises AND Y falls simultaneously = stagflation = monetary policy dilemma

Demand-pull inflation — AD shifts RIGHT:

P₂ ---- New equilibrium (higher P, same/higher Y)
P₁ ---- Original equilibrium

LRAS
AD₂ (right of AD₁)
AD₁

Y₁ (=Yfe)     → Real output

Key: P rises, Y stays at Yfe (if at full employment) = rate rises appropriate

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VERIDIAN™ | © VERIDIAN 2026. All rights reserved. This material is the intellectual property of VERIDIAN. Unauthorised reproduction, resale, or distribution is prohibited. For personal study use only. Not affiliated with or endorsed by Pearson Edexcel.