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Explain the Proportional Method of Measurement of Elasticity

Explain the Proportional Method of Measurement of Elasticity.

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Proportional or Percentage Method: In this method the elasticity of demand is measured through the ratio in between the percentage or proportionate change in quantity demanded and in proportionate change in price.  This is also termed as formula method. This can be computed as given below:

ED = Proportionate change in quantity demanded/Proportionate change in price.
                                           OR
 = (Change in Demand/Original Quantity demanded)/ (Change in Price/Original price)

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