Who this is for: Cambridge IGCSE Economics (0455) students who confuse demand-pull and cost-push inflation — or cannot explain why deflation is also harmful.
What query it owns: how to understand inflation and deflation in Cambridge IGCSE Economics.
Why this is safe: this page owns the revision-guide angle, while Tutopiya’s Inflation and Deflation subtopic page owns the learning resource and the free quiz owns the practice.

Inflation and deflation describe sustained changes in the general price level. Cambridge IGCSE Economics (0455) expects you to define inflation, distinguish demand-pull from cost-push causes, explain consequences for different groups, and link contractionary or expansionary policies to each situation. This guide maps each concept to the explain and evaluate questions examiners set.

Key takeaways

• Inflation = sustained rise in the general price level; deflation = sustained fall.
• Measured by indices such as the Consumer Price Index (CPI).
• Demand-pull inflation: AD grows faster than AS (“too much money chasing too few goods”).
• Cost-push inflation: rising production costs (wages, raw materials, imports) push prices up.
• Policies: contractionary demand-side policy for demand-pull; supply-side measures may help cost-push.

What are inflation and deflation in Cambridge IGCSE Economics?

Inflation is a persistent increase in the average level of prices in an economy. Deflation is a persistent decrease. Cambridge IGCSE Economics (0455) treats stable prices (low, predictable inflation) as a macroeconomic objective because both high inflation and deflation create economic problems.

Read the full notes on Tutopiya’s Inflation and Deflation subtopic page before attempting past-paper questions.

Demand-pull vs cost-push inflation

Type	Cause	Diagram shift	Example
Demand-pull	AD rises faster than AS	AD shifts right	Higher government spending near full capacity
Cost-push	Production costs rise	AS shifts left	Oil price shock raises transport and energy costs

Consequences of inflation and deflation

Effect	Inflation	Deflation
Savers	Lose purchasing power	Gain purchasing power
Borrowers	Benefit (repay in cheaper money)	Hurt (debt burden rises in real terms)
Fixed-income earners	Real income falls	Real income rises
Business planning	Uncertainty if unpredictable	May cut investment; delay purchases
International competitiveness	Exports may become less competitive (if not offset)	Exports may become cheaper abroad

How to answer inflation and deflation questions — step by step

1. Define inflation or deflation (general price level, sustained change).
2. Identify the type — demand-pull or cost-push — from the scenario.
3. Explain the mechanism (AD/AS or cost chain).
4. State consequences for at least one group (savers, borrowers, firms).
5. Test yourself with the Inflation and Deflation quiz.

Past-paper wording: command words that matter

Command word	What the question wants	Typical stem
Define	Precise term	”Define inflation.”
Explain	Cause and effect	”Explain how an increase in oil prices can cause inflation.”
Distinguish between	Two types	”Distinguish between demand-pull and cost-push inflation.”
Evaluate	Weigh up	”Evaluate the consequences of inflation for savers and borrowers.”

Worked exam-style stems (how to answer the wording)

1. “Define inflation.” Inflation is a sustained increase in the general level of prices in an economy over a period of time. Reward: general price level + sustained increase.

2. “Explain how a rise in aggregate demand can cause demand-pull inflation.” When AD increases faster than AS (especially near full capacity), firms raise prices because demand exceeds supply — “too much money chasing too few goods.” Reward: AD exceeds AS + price rise.

3. “Evaluate the consequences of inflation for people on fixed incomes.” Fixed incomes buy fewer goods and services as prices rise, so real purchasing power falls and living standards decline; however, moderate inflation may accompany economic growth and job creation. Reward: real income falls + developed judgement.

How inflation and deflation connect to the rest of IGCSE Economics

Stable prices is a core Macroeconomic Objective, managed through Demand Side Policies and Supply Side Policies. Inflation conflicts with Employment and Unemployment when contractionary policy is used. The Cambridge IGCSE Economics resource hub links every Government and the Macroeconomy subtopic.

Common mistakes students make

• Describing a single price rise (one good) as inflation (inflation is the general price level).
• Confusing inflation (prices rising) with deflation (prices falling).
• Applying demand-side policy alone to cost-push inflation without noting limitations.
• Forgetting that deflation can cause delayed spending and higher real debt burdens.
• Mixing up CPI (consumer prices) with GDP deflator without defining terms.

When you need more support

If inflation and deflation questions keep costing marks, work through the Inflation and Deflation quiz, then get focused help from a Cambridge IGCSE Economics tutor.

Frequently asked questions

What is the difference between demand-pull and cost-push inflation? Demand-pull is caused by excess aggregate demand; cost-push is caused by rising production costs shifting AS left.

Why is deflation a problem? Consumers and firms delay spending expecting lower prices, reducing AD, output and jobs; real debt burdens rise.

How is inflation measured in 0455? Using a price index such as the Consumer Price Index (CPI), which tracks changes in a basket of goods and services.

How do I revise inflation and deflation effectively? Learn both definitions, two causes each, consequences for savers/borrowers, then take the Inflation and Deflation quiz.

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