NO.PZ2016010801000025
问题如下：
Healthy Co. is a factory which producing health care products. The long-run average total cost is $15 per unit and total output is 500 units. The manager plans to increase the total output to 600 units. After some calculation, it is expected that the long-run average total cost will increase to $18. Which of the following description about Healthy Co. is most appropriate?
选项：
A.Healthy Co. is experiencing the constant returns to scale.
B.Healthy Co. is experiencing the diseconomies of scale.
C.Healthy Co. is experiencing the economies of scale.
解释：
B is correct.
When the scale of the business increases (at 600/500-1=20%), the average unit costs increases (at 18/15-1=20%) as well. An upward-sloping long-run average total cost curve means diseconomies of scale.
考点：规模经济。
解析:产出上涨了600/500-1=20%，平均销售成本也上涨了18/15-1=20%
注意到平均单位成本的上涨就意味着企业运行在规模不经济的阶段。
units从500到600
但是他们的成本从15增加到18，那就是slope是上升的，那就是规模不经济啊，还要算吗
