Final answer:
C) marginal private benefit
A voucher can create an efficient outcome when its value matches the marginal social benefit (MSB) of a good, aligning individual purchases with the social optimum.
Step-by-step explanation:
A voucher can eliminate the deadweight loss and lead to an efficient outcome if the value of the voucher equals the marginal social benefit of the good.
In economic terms, the marginal social benefit (MSB) is the total benefit to society of consuming an additional unit of a good or service, and it includes both the private benefit and any external benefits.
Considering that the social benefit should be equal to the social costs for the efficient allocation of resources, matching the voucher value to the MSB would align consumers' purchasing decisions with the social optimum.
In order for a voucher to eliminate deadweight loss and lead to an efficient outcome, the value of the voucher should equal the marginal social benefit (MSB) of the good.
The marginal social benefit represents the extra benefit society receives from producing an additional unit of the good.
When the value of the voucher is equal to the MSB, it aligns the private benefits with the social benefits, resulting in an efficient allocation of resources and no deadweight loss.