Explain how the prices of related goods also affect demand

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Substitute goods are those that can be used in place of each other. The price of the substitute and demand for the other good are directly related. If the price of Coke rises, demand for Pepsi should increase. Complementary goods are those that are used together like tennis balls and rackets. When goods are complements, there is an inverse relationship between the price of one and the demand for the other. Some goods are not related to each other and are independent goods. In these cases, a change in price of one will not affect the demand for the other.