Public Good

In economics, a public good is a good that is both non-excludable and non-rivalrous in that individuals cannot be effectively excluded from use and where use by one individual does not reduce availability to others... This is in contrast to a common good which is non-excludable but is rivalrous to a certain degree.

cf Intellectual Property, Commons, infrastructure, open-source

Excludable Non-Excludable
Rivalrous Private Goods Commons-pool
Non-rivalrous Club-goods Public goods

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