Which statement best describes a reason public goods are underprovided by the market?

Which statement best describes a reason public goods are underprovided by the market?

• A. They are excludable, so firms can charge consumers.
• B. They are rivalrous, so consumption reduces availability.
• C. They are non-excludable and non-rivalrous, leading to a free-rider problem.
• D. They always have high profits for private firms.

Answer: (C)

The main idea here is that public goods are non-excludable and non-rivalrous, which creates a free-rider problem that leads to underprovision by the market. Because you can’t easily exclude people from using a public good, individuals can benefit without paying. This means private firms have little financial incentive to provide them, since they can’t charge all the beneficiaries. Because production won’t be funded through voluntary payments, the market tends to supply less than what’s socially optimal. Governments often fill the gap by providing or financing these goods through taxes. The other statements don’t fit: if a good were excludable, firms could charge and would have a stronger incentive to supply it; if a good were rivalrous, one person’s use would reduce another’s, which is not the case for public goods; and private firms typically do not reap high profits from pure public goods, so that isn’t a reason they would provide them.

The main idea here is that public goods are non-excludable and non-rivalrous, which creates a free-rider problem that leads to underprovision by the market. Because you can’t easily exclude people from using a public good, individuals can benefit without paying. This means private firms have little financial incentive to provide them, since they can’t charge all the beneficiaries. Because production won’t be funded through voluntary payments, the market tends to supply less than what’s socially optimal. Governments often fill the gap by providing or financing these goods through taxes.

The other statements don’t fit: if a good were excludable, firms could charge and would have a stronger incentive to supply it; if a good were rivalrous, one person’s use would reduce another’s, which is not the case for public goods; and private firms typically do not reap high profits from pure public goods, so that isn’t a reason they would provide them.