<P> In economics , a complementary goods or complement is a goods with a negative cross elasticity of demand , in contrast to a substitute goods . This means a good 's demand is increased when the price of another goods is decreased . Conversely , the demand for a goods is decreased when the price of another goods 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 goods 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 goods will be demanded . Basically this means that since the demand of one goods is linked to the demand of another goods , if a higher quantity is demanded of one goods , a higher quantity will also be demanded of the other , and if a lower quantity is demanded of one goods , 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 goods rises , so will the price of the other , and vice versa . With substitute goods , however , the price and quantity demanded of one goods is related inversely to the price and quantity demanded of a substitute goods , meaning that if the price or quantity demanded of one goods rises , the price or quantity demanded of its substitute will fall . </P>
<P> In economics , a complementary goods or complement is a goods with a negative cross elasticity of demand , in contrast to a substitute goods . This means a good 's demand is increased when the price of another goods is decreased . Conversely , the demand for a goods is decreased when the price of another goods 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 goods 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 goods will be demanded . Basically this means that since the demand of one goods is linked to the demand of another goods , if a higher quantity is demanded of one goods , a higher quantity will also be demanded of the other , and if a lower quantity is demanded of one goods , 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 goods rises , so will the price of the other , and vice versa . With substitute goods , however , the price and quantity demanded of one goods is related inversely to the price and quantity demanded of a substitute goods , meaning that if the price or quantity demanded of one goods rises , the price or quantity demanded of its substitute will fall . </P>
if the price of crackers goes up when the price of cheese goes down crackers and cheese are
if the price of crackers goes up when the price of cheese goes down crackers and cheese are
complements
complements