Question

这句话是什么意思？怎样去理解？

If the fifteenth unit costs $10,but yields only $8 of benefit,then it is not rational to purchase it,even if the average cost of the fifteen units is only $8.Purchasing the fifteenth unit yields an economic loss of $2.

Answer 1

如果第十五个部件花费为10美元，但是只能产生8美元收益，因而购买它是不合理的，即便是其平均花费仅仅为8美元。购买它也将在经济上产生损失2美元。

注意：even if the average cost of the fifteen units is only $8与Purchasing the ...之间是句号，所以文中所说的“在经济上产生损失2美元”对应的是最前面说的“第十五个部件花费为10美元”