years as the price of tablet computers has fallen, the quantity demanded has increased (because of the law of

demand). Since people are purchasing tablets, there has been a decrease in demand for laptops, which we can

show graphically as a leftward shift in the demand curve for laptops. A higher price for a substitute good has

the reverse effect.

Other goods are complements for each other, meaning we often use the goods together, because consumption

of one good tends to enhance consumption of the other. Examples include breakfast cereal and milk;

notebooks and pens or pencils, golf balls and golf clubs; gasoline and sport utility vehicles; and the five-way

combination of bacon, lettuce, tomato, mayonnaise, and bread. If the price of golf clubs rises, since the

quantity demanded of golf clubs falls (because of the law of demand), demand for a complement good like golf
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