Complementary goods

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Complementary goods are commodities that depend on each other such that an increase in the price of one good causes a decrease in the demand for the related good. For example, an increase in the price of French toast could cause a decrease in the demand for maple syrup, because those two goods are often consumed together. An increase in the price of salad dressing could cause a decrease in demand for salad. Thus, complementary goods will always have a negative cross elasticity of demand (% change in demand for good A divided by % change in price of good B)

Complementary goods are the opposite of substitute goods.