Why are public goods typically financed through taxation?

• A. Non-excludability and free rider problems cause underprovision in private markets; taxation funds provision.
• B. Public goods are subsidized by private markets.
• C. Public goods are profitable and funded by tariffs.
• D. Public goods are funded by voluntary donations.

Answer: (A)

Public goods are non-excludable and non-rivalrous, so once provided, people can use them without paying and one person’s use doesn’t diminish another’s. In a private market, this creates a free rider problem: individuals have little incentive to pay for something they can benefit from anyway, leading firms to underproduce the good. Because private markets tend to underprovide these goods, society would be worse off without intervention. Taxation allows the government to collect funds from everyone and finance the provision of public goods for the entire population, aligning the cost with the benefit and achieving a socially optimal level of provision.

Subsidizing by private markets wouldn’t reliably solve the issue since the fundamental problem is the inability to charge users directly. Relying on voluntary donations is similarly unreliable due to free riding. Tariffs aren’t the mechanism for funding domestically provided public goods, and public goods aren’t typically profitable in a way that tariffs would finance.