Common good (economics)
- whether the consumption of a good by one person precludes its consumption by another person (rivalrousness)
- whether it is possible to prevent people (consumers) who have not paid for it from having access to it (excludability)
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People tend to overuse the common goods because there is no charge for using them. Accordingly policymakers use numerous strategies to restrict exploitation of common goods. Typical instances are fish in the ocean or congested non toll roads.