Why might a market economy require government intervention to achieve allocative efficiency?

• A. Markets always allocate efficiently; no intervention needed
• B. Markets can fail due to externalities, public goods, information gaps, and equity considerations; government can correct these
• C. Government intervention worsens efficiency in all cases
• D. Only monetary policy matters for efficiency

Answer: (B)

Allocative efficiency means resources are used to produce the mix of goods and services that society values most, with prices guiding production to match consumer preferences. However markets don’t always do this because of certain failures.

Externalities occur when the actions of buyers or sellers affect others who aren’t involved in the transaction. Negative externalities (like pollution) impose costs not reflected in market prices, leading to overproduction; positive externalities (like vaccination) create benefits not captured by prices, leading to underproduction. Government can correct these by taxes or regulation on negative externalities, or subsidies for activities with positive externalities, helping private costs and benefits align with social costs and benefits.

Public goods, such as national defense or street lighting, are often underprovided in a free market because people can free-ride on others’ contributions. Government provision ensures these goods are available.

Information gaps can cause buyers or sellers to make choices that don’t reflect true costs or quality, leading to misallocation. Regulations, standards, and information disclosures help everyone make better-informed decisions.

Equity considerations address the fairness of outcomes. Some resource allocations that are efficient in a narrow sense may be viewed as unfair, so government redistribution can improve overall welfare and move the economy closer to a socially desirable allocation.

Other choices ignore these market failures or assume government action always reduces efficiency, which isn’t generally true and doesn’t reflect how intervention can correct misallocations.