Oyster crackers are a complement for clam chowder. if the price of clam chowder falls, the quantity of clam chowder demand for oyster crackers. because of the change in the equilibrium quantity of oyster crackers, the demand for wheat flour by oyster crackers producersrisesfalls, causing the equilibrium price of wheat flour todecreaseincrease. this means producers of bread facehigherlowerinput prices, and the supply of breaddecreasesincreases. the resultingrisefallin the price of bread causes people to substituteaway from cereal and toward breadaway from bread and toward cereal, so the demand for cerealrisesfalls