Goodyear Tire and Rubber Company manufactures a well-known automotive tire. They are produced in Goodyear plants and sold to consumers in many outlets including auto parts retail chains such as Pep Boys. Both Goodyear and Pep Boys need to calculate the cost of a tire for, among other things, determining the cost of goods sold and inventory balances for financial statements. What are some important differences in determining the cost of tires for the two companies?