An example of a public good is

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Quizplus · Accepted Answer

National defense is a classic example of a public good because it benefits all citizens regardless of whether or not they pay for it. It is non-excludable, meaning that it is impossible to prevent someone from benefiting from it, and non-rivalrous, meaning that one individual's use of national defense does not reduce the amount available for others to use. The other options listed are not public goods because they are either excludable or rivalrous in nature.

An Example of a Public Good Is