What is a common resource good?

• A. A scarce resource that provides users with tangible benefits but nobody in particular owns or has exclusive claim to.
• B. A resource that is easy to exclude and not rival.
• C. A private good that is excludable and rival.
• D. A public good that is non-rival.

Answer: (A)

Common resource goods are resources that many people can use, but no one can be easily excluded from using, and each use by someone reduces what's left for others. They’re scarce and provide tangible benefits to users, yet there’s no single owner with exclusive claims. That combination—non-excludable and rivalrous use—fits the description here: a scarce resource with benefits to many, without exclusive ownership. The other options describe different types of goods: one that can be easily excluded and is not rival in consumption, a private good that is both excludable and rival, or a public good that is non-excludable and non-rival.