<P> In economics , a complementary good or complement is a good with a negative cross elasticity of demand , in contrast to a substitute good . This means a good 's demand is increased when the price of another good is decreased . Conversely , the demand for a good is decreased when the price of another good is increased . If goods A and B are complements , an increase in the price of A will result in a leftward movement along the demand curve of A and cause the demand curve for B to shift in ; less of each good will be demanded . A decrease in price of A will result in a rightward movement along the demand curve of A and cause the demand curve B to shift outward ; more of each good will be demanded . Basically this means that since the demand of one good is linked to the demand of another good , if a higher quantity is demanded of one good , a higher quantity will also be demanded of the other , and if a lower quantity is demanded of one good , a lower quantity will be demanded of the other . The prices of complementary goods are related in the same way : if the price of one good rises , so will the price of the other , and vice versa . With substitute goods , however , the price and quantity demanded of one good is related inversely to the price and quantity demanded of a substitute good , meaning that if the price or quantity demanded of one good rises , the price or quantity demanded of its substitute will fall . </P>
<P> In economics , a complementary good or complement is a good with a negative cross elasticity of demand , in contrast to a substitute good . This means a good 's demand is increased when the price of another good is decreased . Conversely , the demand for a good is decreased when the price of another good is increased . If goods A and B are complements , an increase in the price of A will result in a leftward movement along the demand curve of A and cause the demand curve for B to shift in ; less of each good will be demanded . A decrease in price of A will result in a rightward movement along the demand curve of A and cause the demand curve B to shift outward ; more of each good will be demanded . Basically this means that since the demand of one good is linked to the demand of another good , if a higher quantity is demanded of one good , a higher quantity will also be demanded of the other , and if a lower quantity is demanded of one good , a lower quantity will be demanded of the other . The prices of complementary goods are related in the same way : if the price of one good rises , so will the price of the other , and vice versa . With substitute goods , however , the price and quantity demanded of one good is related inversely to the price and quantity demanded of a substitute good , meaning that if the price or quantity demanded of one good rises , the price or quantity demanded of its substitute will fall . </P>
to increase the demand for complementary products the price of a product often is
to increase the demand for complementary products the price of a product often is
decreased
decreased