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Price Elasticity of demand

A measure of the extent to which the quantity
demanded of a good changes when the price of
the good changes.

To determine the price elasticity of demand, we
compare the percentage change in the quantity
demanded with the percentage change in price.
THE PRICE ELASTICITY OF
DEMAND :
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Percent change in price=     New price- Initial Price

                           (New Price + Initial Price) ÷ 2   X 100
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THE PRICE ELASTICITY OF SUPPLY
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CROSS ELASTICITY AND INCOME
ELASTICITY
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Elasticities of demand and supply