National defense is often cited as a major example of a

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National defense is a classic example of a public good, which is a good that is non-excludable and non-rivalrous in consumption. Non-excludability means that it is difficult or impossible to prevent someone from benefiting from the good once it is produced, and non-rivalry means that one person's consumption of the good does not diminish the amount available for others to consume. National defense is non-excludable because it is difficult to prevent someone from benefiting from it once it is provided, whether or not they contributed to its production through taxes. It is also non-rivalrous because the defense of one person or group does not diminish the ability of others to be defended.

National Defense Is Often Cited as a Major Example of a