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.

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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.
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.

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.
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”

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