Public Goods and Market Failure

Steps:

• Identify the benefit: Face masks prevent infection spread, benefiting society beyond the wearer.
• Recognize the issue: Not everyone wears them, leading to underuse despite collective gains.
• Classify the good: Face masks exhibit public good traits, causing free-rider problems.
• Conclude inefficiency: Free markets underprovide public goods due to non-excludability and non-rivalry.

Why A is correct:

• Public goods are non-rival (one person's use doesn't reduce availability for others) and non-excludable (hard to prevent non-payers from benefiting), leading to free-riding and inefficient allocation per economic theory.

Why the others are wrong:

• B: No evidence of monopoly; issue stems from good's nature, not producer power.
• C: Imperfect information isn't mentioned; reluctance ties to free-riding, not info gaps.
• D: Perfect information wouldn't fix public good underprovision; it exacerbates free-riding.

Final answer: A