The change in the amount sold will be greater when the price elasticity of demand is greater than 1. (option 3).
Price elasticity of demand measures the responsiveness of quantity demanded to changes in price of the good.
Price elasticity of demand = percentage change in quantity demanded / percentage change in price
Demand is elastic when the coefficient of demand is greater than one. This means that for a small change in price, the quantity demanded would be greater.
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