Answer :
The optimal output of a public good occurs where The marginal benefit of the consumer who values the good most should equal the marginal cost of the good.
What is the meaning of marginal benefits?
The marginal benefit is the maximum amount of money a customer is willing to pay for a new product or service. With more consumption, consumer satisfaction tends to decline.
For example, if a customer is prepared to spend $5 for ice cream, the ice cream's marginal benefit is $5.
Thus, option C is correct.
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