Complement good
A complement good is a good whose cross elasticity of demand is negative. This means that if more of Good A is bought more of Good B would also be bought if they are compliments. An example of compliment goods are hamburgers and hamburger buns. If the price of hamburgers falls, more hamburger buns would be sold because the two are usually used toghether.The opposite of a complement good is a substitute good.
See list of economics topics, consumer theory
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