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Price Elasticity of Supply

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Topics

  • Price Elasticity of Supply
  • Definition: Elasticity of Supply
  • Meaning of Elasticity of Supply
  • Formula: Elasticity of Supply
  • Types of Supply Elasticity
  • Distinction Between Contraction of Supply and Decrease in Supply
  • Real-Life Application
  • Key Point Summary
CISCE: Class 12

Price Elasticity of Supply

Law of Supply: If the price of a commodity increases, the supply usually goes up. But how much does supply change? That’s where elasticity of supply helps.​

CISCE: Class 12

Definition: Elasticity of Supply

  • "Elasticity of supply is defined as the percentage change in quantity supplied by percentage change in price." – Prof. Bilas
  • "Elasticity of supply is the ratio of percentage change in 'quantity supplied over the percentage change in price." – Lipsey
CISCE: Class 12

Meaning of Elasticity of Supply

  • Price elasticity of supply measures how much the quantity supplied changes when the price changes.
  • It tells us if supply is sensitive or not to price changes.
  • It shows the ratio between percentage change in supply and percentage change in price, not just the actual amounts.
CISCE: Class 12

Formula: Elasticity of Supply

\[e_s=\frac{\text{Proportionate Change in Quantity Supplied}}{\text{Proportionate Change in Price}}\]

Where:

  • es: Elasticity of supply
  • Δq: Change in quantity supplied
  • ΔP: Change in price
  • q: Original quantity supplied
  • p: Original price
CISCE: Class 12

Types of Supply Elasticity

Type Description What it Means
Elastic Supply Supply changes more than price Small price rise, bigger supply increase
Inelastic Supply Supply changes less than price Price rises, supply barely increases
CISCE: Class 12

Distinction Between Contraction of Supply and Decrease in Supply

Contraction of Supply Decrease in Supply
Description Quantity supplied falls at lower price
Reason Due to fall in price of commodity
Supply Curve Downward movement along same supply curve
CISCE: Class 12

Real-Life Application

  • Imagine a shopkeeper: If prices of sweets rise by 10%, and he brings out 20% more sweets to sell, his supply is highly elastic!
  • If he only brings 3% more, his supply is inelastic.
CISCE: Class 12

Key Point Summary

  • Price elasticity of supply shows how responsive supply is to price changes.
  • “Contraction” happens when price falls, and supply moves down along the curve.
  • “Decrease” happens due to other factors; the whole curve shifts left.

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