What is a free rider problem, and why does it arise with public goods?

• A. A person pays more than their share to support a good.
• B. A person benefits from a good without paying for it.
• C. Governments always charge for public goods.
• D. It occurs only with private goods.

Answer: (B)

The main idea is the free rider problem, which happens when people can benefit from a good without paying for it. Public goods are hard to exclude (non-excludable) and often non-rivalrous (one person’s use doesn’t greatly reduce another’s). Because anyone can enjoy the benefit regardless of contribution, individuals have little incentive to pay, leading to underprovision in a market. Governments often provide these goods and fund them through taxes to ensure they’re available.

The other statements don’t fit: paying more than one’s share describes someone who overpays, not a free rider; governments charging for public goods is not the essence of the issue—it's the incentive to free-ride; and the problem doesn’t occur only with private goods, since private goods are excludable and rival, which makes free riding less of an issue.