Consider the Business Application, “Filling Excess Capacity ‘below Cost’.” As noted there, the determination of cost depends on the way in which costs of delivery services are allocated to the different customers. Assume that the USPS has two types of customers: people who mail first class letters and business that ship packages to customers. Management at USPS wants to understand how profitable each customer group is. How would you recommend the costs of the USPS network (trucks, buildings, carriers, and so on) be allocated to these two customers to answer that question?