1.The efficient amount of pollution abatement occurs at the point at which the marginal social cost of abatement is ______ to its marginal social benefit.

2.The marginal social cost rises while the ____ declines

3.The efficient amount of ___ is likely to be greater than zero but less than ___ percent.

4.In practice it is difficult to determine the ___ level of pollution abatement

5.The difficulty in assessing the costs and benefits of abating pollution and the way they vary at the ___ as more abatement is achieved.

6.___ supply of pure public goods requires a means of allowing consumers to express their valuation of additional units of pure public goods.

7The ___of any given quantity of a pure public good is the sum of the individual marginal benefits of all consumers.

8.To achieve efficiency, this must equal the ___ of the good.