Public Good
In economics, a public good refers to a commodity or service that is made available to all members of a society [1].
A public good has two key characteristics which make it difficult for market producers to sell the good to individual consumers [2].
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Nonexcludable means that it is costly or impossible for one user to exclude others from using a good
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Nonrivalrous means that when one person uses a good, it does not prevent others from using it.