6355 Lecture Notes - Lecture 3: Ceteris Paribus, Price Ceiling, Common Agricultural Policy

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Week 3 - Elasticity, Market Outcomes and Market Intervention
Elasticity: a measure of how much one economic variable - such as the quantity
demanded of a product - responds to changes in another economic variable
Price elasticity of demand: the responsiveness of the quantity demanded of a good
to change in its price
To calculate price elasticity of demand
Divide the percentage change in the quantity demanded of a product by the
percentage change in its price
Always negative
An increase in price decreases the quantity demanded, ceteris paribus
By convention, the minus sign is ignored
Elastic demand: demand is elastic when the percentage change in quantity
demanded is greater than the percentage change in price
the price of elasticity is greater than one in absolute value
Inelastic demand: demand is inelastic when the percentage change in quantity
demanded is less than the percentage change in price
The price elasticity is less than one in absolute value
Unit-elastic demand: demand is unit-elastic when the percentage change in quantity
demanded is equal to the percentage change in price
The price elasticity is equal to one in absolute value
Mid Point Formula
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Document Summary

Week 3 - elasticity, market outcomes and market intervention. Elasticity: a measure of how much one economic variable - such as the quantity demanded of a product - responds to changes in another economic variable. Price elasticity of demand: the responsiveness of the quantity demanded of a good to change in its price. Divide the percentage change in the quantity demanded of a product by the percentage change in its price. An increase in price decreases the quantity demanded, ceteris paribus. By convention, the minus sign is ignored. Elastic demand: demand is elastic when the percentage change in quantity demanded is greater than the percentage change in price. The price of elasticity is greater than one in absolute value. Inelastic demand: demand is inelastic when the percentage change in quantity demanded is less than the percentage change in price. The price elasticity is less than one in absolute value.

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