A marginal _________ function shows the change in damages as a result of a unit change in emissions (排放 ) or ambient concentration
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__________ (阈值) are levels of emissions or ambient concentration below which marginal damages are zero.
__________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.