If the marginal social cost of attaining a certain level of water purity exceeds the marginal social benefit,the level of water purity should be decreaseD.

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Quizplus · Accepted Answer

This is because if the marginal social cost exceeds the marginal social benefit, it means that the resources expended on attaining the higher level of water purity are not justified by the benefits received. Therefore, reducing the level of water purity may be more efficient in allocating resources towards other areas with greater benefits.

If the Marginal Social Cost of Attaining a Certain Level