We analyzed the planning problem for HIV screening, testing and care. This problem consists of determining the optimal fraction of patients to be screened in every period as well as the optimum staffing level at each part of the health care system to maximize the total health benefits to the...

Supply chains often consist of several tiers, with different numbers of firms competing at each tier. A major determinant of the structure of supply chains is the cost structure associated with the underlying manufacturing process. In this paper, we examine the impact of fixed and variable costs...