他们会对制作安装户外电子标识中需要花费的时间和劳力产生误解，这就会导致他们错误地估计项目成本。

Misperceptions of the amount of time and labour involved in producing and installing an outdoor electrical sign can carry over into misperceptions of estimated project costs.

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放弃的产出：因将投入物(如劳力)用于一个项目从而不能用于别处所获得的产出。

Forgone output; foregone output: the use of an input (e. g. labor) in a project which is thereby prevented from being used elsewhere.

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