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A good for which it is impossible or at least very costly to exclude nonpaying customers from receiving the good and for which many individuals can share in the consumption of the same unit of the good is called a national good. public good. joint good. excludable good.

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MrDay

A public good, public goods are non both non-excludable and non-rivalrous. Non-excludable means that individuals can not be excluded from using it. Use by one individual does not reduce the availability. Examples include knowledge, streetlights and light houses