Asked by ai chudi
What is the difference between elastic and inelastic demand?
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Answered by
GPT-5 mini
AI
Elasticity of demand measures how much quantity demanded responds to a change in price. The key difference:
- Elastic demand: quantity demanded changes a lot when price changes.
- Formally: price elasticity of demand (PED) |%ΔQ / %ΔP| > 1.
- Consumers are sensitive to price. Small price changes cause large changes in quantity demanded.
- Examples: luxury goods, goods with many close substitutes, non-necessities, items that take a large share of income.
- Revenue effect: increasing price tends to reduce total revenue (because the drop in quantity outweighs the higher price).
- Inelastic demand: quantity demanded changes little when price changes.
- Formally: |%ΔQ / %ΔP| < 1.
- Consumers are not very sensitive to price. Large price changes cause only small changes in quantity demanded.
- Examples: basic necessities (insulin, salt), goods with few substitutes, small-cost items relative to income.
- Revenue effect: increasing price tends to raise total revenue (because the small decrease in quantity is outweighed by the higher price).
Other notes:
- Unit elastic: |PED| = 1 (price change yields proportional change in quantity; revenue stays the same).
- Extreme cases: perfectly elastic (infinite elasticity — any price increase drops demand to zero) and perfectly inelastic (zero elasticity — quantity demanded does not change at all).
- Determinants of elasticity include availability of substitutes, proportion of income spent on the good, time horizon, and how narrowly the market is defined.
Quick numeric example:
- If price rises 10% and quantity demanded falls 20% → PED = 20%/10% = 2 (elastic).
- If price rises 10% and quantity demanded falls 5% → PED = 5%/10% = 0.5 (inelastic).
- Elastic demand: quantity demanded changes a lot when price changes.
- Formally: price elasticity of demand (PED) |%ΔQ / %ΔP| > 1.
- Consumers are sensitive to price. Small price changes cause large changes in quantity demanded.
- Examples: luxury goods, goods with many close substitutes, non-necessities, items that take a large share of income.
- Revenue effect: increasing price tends to reduce total revenue (because the drop in quantity outweighs the higher price).
- Inelastic demand: quantity demanded changes little when price changes.
- Formally: |%ΔQ / %ΔP| < 1.
- Consumers are not very sensitive to price. Large price changes cause only small changes in quantity demanded.
- Examples: basic necessities (insulin, salt), goods with few substitutes, small-cost items relative to income.
- Revenue effect: increasing price tends to raise total revenue (because the small decrease in quantity is outweighed by the higher price).
Other notes:
- Unit elastic: |PED| = 1 (price change yields proportional change in quantity; revenue stays the same).
- Extreme cases: perfectly elastic (infinite elasticity — any price increase drops demand to zero) and perfectly inelastic (zero elasticity — quantity demanded does not change at all).
- Determinants of elasticity include availability of substitutes, proportion of income spent on the good, time horizon, and how narrowly the market is defined.
Quick numeric example:
- If price rises 10% and quantity demanded falls 20% → PED = 20%/10% = 2 (elastic).
- If price rises 10% and quantity demanded falls 5% → PED = 5%/10% = 0.5 (inelastic).
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