When calculating the price elasticity of demand,it is assumed that all of the other determinants of demand are to be held constant.

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This assumption is necessary because price elasticity of demand measures the responsiveness of quantity demanded to changes in price, while holding all other factors constant. If other factors affect demand, their impact on quantity demanded will be mixed with that of the price change, making it difficult to isolate price elasticity. Therefore, the calculation assumes that those other factors are constant, or that they see no significant change in response to the price change being analyzed.

When Calculating the Price Elasticity of Demand,it Is Assumed That