Which of the following is a reason why the socially optimal outcome is not always achieved after government intervention?

• A. Absence of externalities in the economy.
• B. Market prices always reflect true costs and benefits.
• C. Administrative costs, imperfect information, political incentives, enforcement issues.
• D. Perfect competition ensures optimality regardless of policy.

Answer: (C)

When government action is used to move toward the socially optimal outcome, it can still fail to hit that target because the policy itself can introduce new costs and distortions. Administrative costs mean the resources spent designing, implementing, and monitoring programs consume part of the gains from the intended improvement. Information is rarely perfect, so policymakers may not know the true size or even the direction of the externality, leading to policies that are miscalibrated. Political incentives—such as lobbying, pork-barrel politics, or short-term reelection concerns—can shape policies in ways that favor special interests or overlook the broader social benefits. Enforcement issues mean not everyone complies, or costs of enforcement erode the policy’s effectiveness, causing the intended benefits to fall short.

Put another way, even a well-meaning policy can be undermined by the frictions and incentives present in the real world, so the outcome after intervention isn’t guaranteed to be socially optimal. The other ideas imply either no need for intervention or that markets already reflect true costs and benefits, which aren’t generally the case, or that perfect competition makes policy unnecessary, none of which capture the real sources of inefficiency in policy implementation.