From the following, national defense contains most of the characteristics of a public good.
A public good is a type of good which has two attributes, one is the non-excludability, which means the producer can’t prevent the use of the good by others, so here no one is excluded by the use of it. Second, the non-rivalry, which means that many people can use the good simultaneously.
The classic example of a public good is national defense. Here national defense is clearly non-excludable because, if we spend the resources necessary to defend our national borders, it isn’t going to be possible to defend everything.
Hence, option A is correct.
To learn more about public goods here:
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