Which characteristic is associated with a first-best externality policy?

• A. It relies on tariffs to adjust prices.
• B. Always requires government budgets to be balanced.
• C. Favors any outcome that maximizes producer surplus.
• D. Requires distortion-free alignment of SMB and MSC at the social optimum, with no administrative or distortion costs.

Answer: (D)

The main idea is that a first-best externality policy would perfectly align social marginal benefit with social marginal cost at the socially optimal quantity, and it would do so without creating any new distortions or administrative costs. Externalities cause markets to fail because individuals ignore the spillover effects on others, so the policy must internalize that externality—think of a Pigouvian tax for a negative externality or a subsidy for a positive one—so SMB equals MSC. If such a policy could be implemented without any distortion or administrative burden, it would achieve the highest possible social welfare with no deadweight loss. Choices that rely on tariffs or that prioritize producer surplus don’t ensure that the social optimum is reached, since they change prices or distributions instead of aligning the social benefits and costs. While budget constraints or other political realities can complicate achieving this ideal, the defining feature remains the distortion-free alignment of SMB and MSC at the social optimum, with no additional costs.