A change in the quantity demanded refers to a change in the amount of a good or service that consumers are willing to purchase over some period of time because of a change in one of the demand function variables other than the price of a good.

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A change in the quantity demanded refers to a movement along the demand curve as a result of a change in the good's price, not changes in other demand function variables. Changes in variables other than the price lead to a shift in the entire demand curve, which is referred to as a change in demand.

A Change in the Quantity Demanded Refers to a Change