In economics,a public good

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A public good is a good that is non-excludable, meaning that it cannot be denied to consumers who have not paid for it, and non-rival, meaning that one person's use of the good does not diminish the availability of the good for others. Examples of public goods include national defense, public parks, and street lighting. While the government may provide some public goods, not all public goods are produced by the government. Public goods are not provided in an optimal amount by the market, as the market does not have a profit incentive to produce goods that are non-excludable and non-rival in nature.

In Economics,a Public Good