当我们面临对错的选择时，我们经常无意识的在生活中使用边际成本法则。
Unconsciously, we often employ the marginal cost doctrine in our personal lives when we choose between right and wrong.
这样，在一定人数内，新增一个消费者的边际成本基本为零，但是当使用者达到一定人数后，新增一个消费者的边际成本将非常明显。
That is, the marginal cost of an additional user is essentially zero for a sizeable number of users, but then marginal cost grows rapidly in the number of users.
最近安装的系统倾向于有超量能力的趋势，而由于使用它们的即时边际成本似乎可以忽略不计，管理层常鼓励新的使用。
Recently installed systems tend to have excess capacity, and since the immediate marginal costs of using them seem to be negligible, management often encourages new uses.
边际使用者成本——使用者最后一单位资源成本。
Marginal user cost----The user cost of the last unit of resource.
边际使用者成本——使用者最后一单位资源成本。
Marginal user cost----The user cost of the last unit of resource.
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