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Definition: (1) A pool or set of common resources together with the agents controlling inflows and outflows of resources from the pool; (2) A bundle of rights held jointly or collectively by a group of people; traditionally referred to land or real property, more recently also includes many other types of valuables (knowledge, open source softwareinformation, copyrights, social relations). (3) An association of those controlling such pools or collectively holding such rights. [d] [e]