Two goods are considered to be complements if they are typically used together. Examples might be: golf balls and golf courses, hiking boots and backpacks, peanut butter and jelly, or computers and scanners. Indeed, complementary goods often (but not always) require that the consumer have both goods, for either good to be enjoyed.

   If there is a change in price of one of the two goods considered to be complements, it will affect demand for the other good. For example, if the average greens fee increases at golf courses, fewer golf balls will be demanded. If the price of computers falls, more scanners will be demanded. If the price of gasoline rises, fewer automobile tires will be demanded.

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