Petroleum prices affect the aluminum market in two ways. From a demand perspective, petroleum prices have a direct impact the on cost of plastics, a substitute for aluminum. From a supply perspective, producing aluminum is a highly energy intensive process. Petroleum prices are an input to the cost of production for aluminum production and thus have a direct impact on the cost of aluminum production. In a supply-and-demand diagram, show how an increase in petroleum prices affects the demand curve and supply curve for aluminum (shifts). Use the supply-and-demand diagrams to illustrate and to obtain the new equilibrium price and quantity.