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The concept of price elasticity of demand has been defined by different economies as under:

“Elasticity of demand may be defined as the percentage change in quantity demanded to the percentage change in-price.”

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“Elasticity of demand is the ratio of relative change in quantity to relative change in Price.”

“ The elasticity of demand for a commodity is the rate at which quantity bought change the price change.”

“The elasticity of demand is a measure of the relative change in quantity to a relative change in price”.

“Elasticity of demand measures the responsiveness of demand to changes in price”.

Explanation:

d. all of the above are true.

answer/// product differentiation;