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a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve. 3 people found this useful. Edit. Share to: 1  The Job Outlook and Salary Trends for a Cosmetologist Cosmetology is a field with many different opportunities for its professionals.
And if the price goes down, the quantity demanded goes up. But what the Law of Demand does not tell us is how much the quantity demanded changes when the price changes. The Law of Demand tells us the direction in which quantity demanded will change, but it does not tell us the magnitude of that change.f price goes up and quantity remains unchanged, total revenue will rise. But the second effect is that quantity in fact will not remain unchanged. When price goes up, the quantity demanded (and therefore the quantity sold) goes down. And by itself, the lower quantity causes total revenue to go down.