3-2 Shifts in Demand Curves
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Change in Quantity Demand
A movement between points along on a demand curve
Normal good
Any good for which there is a Direct relationship between changes in income and its demand curve.
Inferior good
Any good for which there is an Inverse relationship between changes in income and its demand curve.
Substitute
Goods that compete for consumer purchases.
Complement
Goods that consumers purchase together with another good.
Change in Demand
and increase (rightward shift) or a decrease (leftward shift) in the demand curve.