+A **Public Good** is a shared benefit, available to all without direct cost, where one's use does not diminish its availability for others. It is characterized by [Non-Excludability](/wiki/non-excludability) and [Non-Rivalry](/wiki/non-rivalry), often requiring collective provision.
+## See also
+- [Free Rider](/wiki/free_rider)
+- [Collective Action](/wiki/collective_action)
+- [Market Failure](/wiki/market_failure)
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