Price Elasticity of Demand (PED)

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Formula: PED = %ΔQd ÷ %ΔP

PED = -2.00

Working: PED = -10 ÷ 5

Interpretation: Elastic — relatively responsive.

Exam tip: Remember Max and Sanjeeth at a concert — the QUEUE before you PEE: put %ΔQ before %ΔP (quantity change on top, price change on the bottom).

Factors affecting PED (price elasticity of demand)

  • Few substitutes — if consumers cannot easily switch to another product, demand is more price inelastic (PED closer to 0). A price rise causes only a small fall in quantity demanded.
  • Low competition — with few rival firms or brands, consumers have less choice, so demand tends to be more inelastic.
  • Habitual / addictive goods — cigarettes, coffee or daily routines make consumers less responsive to price changes → lower PED (more inelastic).
  • Price sensitivity — if buyers are highly aware of and react to price changes, demand is more elastic (higher |PED|). Luxury or easily postponed purchases are often more price sensitive.
  • Proportion of income — goods that take up a large share of a consumer's budget (e.g. rent, cars) tend to have more elastic demand, because a price change has a bigger impact on real spending power.
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