Suppose that at the current output level the marginal social cost of producing a good is greater than its marginal private cost, and that the marginal social benefit associated with production of the good is equal to its marginal private benefit. Which of the following government actions would most likely increase efficiency?

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BlackTom AI · Accepted Answer

In this scenario, the social marginal cost exceeds the private marginal cost, while the social marginal benefit equals the private marginal benefit. This means there is a negative externality from production: the true social cost of producing each unit is higher than what producers account for in their decisions, so quantity produced is too high for society.

Option 1: Giving tax rebates to people who purchase the good. This would encourage more consumption, which exacerbates overproduction and worsens the externality. It does not address the higher social cost of production, and could lower efficiency rather than raise it.

Option 2: Taxing the production of a good. This directly raises the private cost of production to align with the social cost, internalizing the externality. By reducing production toward the socially optimal quantity, overall welfare improves and efficiency increases. This is the standard Pigouvian approach to negative externalities in production.

Option 3: Subsidizing production of complementary goods. Subsidies to related goods may affect demand or supply in ways that do not specifically correct the misalignment between social and private costs of the targeted good. Without addressing the external cost, efficiency is unlikely to improve in the presence of a higher social cost.

Option 4: Taxing the production of substitute goods. Taxing substitutes could shift production and consumption away from the original good, but it does not directly correct the external cost of producing the good in question. It may reduce overall output of some goods but does not internalize the specific externalities here.

Option 5: Subsidizing consumption of the good. Subsidies increase consumption, moving production decisions further from the social optimum and worsening the efficiency problem created by the external cost.

Overall, only taxing the production of the good aligns private incentives with social costs, reducing output toward the socially optimal level and improving efficiency in the presence of a negative production externality.

AP Economics-Hillebrand AP Microeconomics Sem 1 Exam 2025 - Requires Respondus LockDown Browser

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