Note—Can a Reduction in Set Up Costs Indeed Increase Total Costs?
指出Zangwill的一个例子中降低设置成本导致总成本上升，是因为限制了策略为“贪婪”型；真正最优策略的期望成本不会上升。
Zangwill (Zangwill, W. I. 1987. From EOQ towards ZI. Management Sci. 33 1209–1223.) has constructed an example which purports to show that reducing set up costs can increase total cost. We show that this happened as a result of restricting the policies to be of a “greedy” nature. The expected cost of truly optimal policies is shown not to increase.