Change in demand vs. change in quantity demanded

This movie explains the difference between a change in demand and a change in quantity demanded. The trick here is to remember that demand represents the relationship between price and quantity while quantity demanded is a single number that the consumers wish to purchase. Sometimes a question will ask what the change in quantity demanded is (which is a number) or what will happen to change demand (which requires a change in one of the determinants).

More info can be found at http://www.freeeconhelp.com/2011/08/c....

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