What is the tragedy of the commons?

• A. When a resource is privately owned and managed efficiently.
• B. When individuals overuse a common resource, leading to depletion and reduced welfare for all.
• C. When public goods are provided by private firms with perfect competition.
• D. When government imposes taxes that perfectly solve the problem.

Answer: (B)

The tragedy of the commons occurs when a resource is shared and not excludable but is rivalrous. Each user benefits from taking a bit more, but the cost of that extra use is borne by everyone. Without clear property rights or rules, individuals overuse the resource to maximize their own benefit, leading to depletion and lower welfare for all.

Think of a communal grazing field or a fishery open to many, where anyone can use it but there’s no good way to exclude anyone or limit effort. If everyone takes as much as they can, the resource wears down or runs out, harming the whole community. private ownership or strong regulation can align individual incentives with social welfare, and rules or quotas can prevent overuse.

The other options don’t fit as well. A privately owned resource managed efficiently describes a situation without the overuse problem. Public goods provided by private firms under perfect competition miss the essence of a shared resource and the free-rider/underfunding issues of public goods. Taxes that perfectly solve the problem imply an unrealistic perfect fix; in practice, regulation or property rights are needed to prevent overuse.