Why is national defense an example of a public good?

The second aspect of public goods is what economists call “nonrivalrous consumption.” ... If the good is excludable, private entrepreneurs will try to serve as many fee-paying customers as possible, charging lower prices to some customers if need be. One of the best examples of a public good is national defense.

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explanation:

not always that can be recessionary too

a. factors that are used to make goods and services