Subsidies correct underconsumption of merit goods

Steps:

• Identify the role of subsidies: they lower production costs for firms, shifting supply rightward and reducing prices.
• Recognize market failures: merit goods have positive externalities, leading to underconsumption.
• Link subsidy effect: cheaper prices encourage more consumption of beneficial goods like education or healthcare.
• Eliminate mismatches: subsidies boost supply, not restrict it or address non-production issues.

Why D is correct:

• Merit goods are underprovided due to positive externalities (benefits to society beyond the consumer); subsidies increase output and consumption to reach socially optimal level.

Why the others are wrong:

• A: Public goods require direct government provision, as private firms underproduce due to non-excludability, not fixed by firm subsidies.
• B: Monopoly power needs antitrust regulation or price controls to curb excess profits, not subsidies that could worsen it.
• C: Demerit goods like tobacco face overconsumption from negative externalities; taxes reduce it, while subsidies would increase it.

Final answer: D