__________ (阈值) are levels of emissions or ambient concentration below which marginal damages are zero.
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__________Costsare the costs of reducing the quantity of residuals.
___________abatement costs show the added costs of achieving one unit decrease in emission level
___________Cost is added to the Marginal Abatement Cost to show the actual costs.
The level at which marginal damages are equal to marginal abatement costs is called the __________ Efficient Level of emissions.