The Examiner's Vault: Price Elasticity of Demand Explained (CIE 9708)
- Excel in Economics
- Jun 30
- 2 min read
Updated: 4 days ago
--- title: "The Examiner's Vault: Price Elasticity of Demand Explained (CIE 9708)" tags: "CIE 9708, A-Level Economics, Microeconomics, PED, Elasticity" excerpt: "PED is the most tested concept in A-Level Economics. Learn how to define it, calculate it, and explain why businesses care about it — all in one structured answer." ---
# The Examiner's Vault: Price Elasticity of Demand (PED) — The Complete Breakdown
If there is one concept that Cambridge examiners absolutely *love* to test, it is Price Elasticity of Demand. It appears in Paper 1, Paper 2, Paper 3, AND Paper 4. If you cannot explain PED in your sleep, you are guaranteed to lose marks.
The Question: > **"Define price elasticity of demand and explain why it is important for businesses."** > *(4 Marks)*
📝 The Bullet Point Plan: * Define PED: responsiveness of Qd to a change in price. * State the formula: PED = %ΔQd / %ΔP. * Importance 1: Pricing strategies (elastic vs inelastic goods). * Importance 2: Production and revenue decisions.
✍️ The Basic Answer:
[DEFINE] Price elasticity of demand (PED) measures the responsiveness of the quantity demanded of a good or service to a change in its price. It is calculated using the formula: PED = %ΔQd / %ΔP.
[EXPLAIN] PED is important for businesses as it informs pricing strategies. If demand for a product is price inelastic (PED < 1), businesses can increase prices without a significant drop in quantity demanded, leading to higher revenue. For example, pharmaceutical companies often raise prices for life-saving drugs, as consumers continue purchasing them despite price increases.
[APPLY] Conversely, if demand is price elastic (PED > 1), lowering prices can attract more customers, potentially increasing revenue. Airlines, for instance, analyze ticket demand elasticity to adjust prices during peak and off-peak seasons.
🔒 Want to Score Full Marks?
The basic answer above earns you 2-3 marks. But the mark scheme requires *specific* formula notation and examiner-approved phrasing to hit 4/4.
> 🛑 [CONTENT LOCKED] > > * 📝 Examiner Commentary: The exact wording that earns full marks (Missing) > * 📊 Evaluation Matrix: Elastic vs Inelastic Revenue Strategies (Missing) > * 🔢 Follow-up 8-mark question: Factors influencing PED (Missing) > > 👉 [Get the Ultimate CIE 9708 Essay Bank PDF Bundle Here!](#) > *The only resource with examiner-verified model answers for every single PED question.*