If there is a marginal external benefit in a market, then which of the following is correct? Circle or identify all that apply.

a. There is too little of a good thing.

b. Consumers or produces underestimate the benefit of their activity.

c. Government must produce the good in order to have market efficiency.

d. A law requiring consumers to buy or consume a minimum quantity of this good or service could be appropriate.

e. The good or service should be taxed to generate revenue for government.