Public good (economics) - Wikipedia
https://en.wikipedia.org/wiki/Public_good_(economics)
In economics, a public good is a good that is both non-excludable and non-rivalrous. For such utilities, users cannot be barred from accessing and/or using them for failing to pay for them. Also, use by one person neither prevents access of other people nor does it reduce availability to others. Therefore, the good can be used simultaneously by more than one person. This is in contrast to a common good such as wild fish stocks in the ocean, which is non-excludable but rivalrous to a certain degr
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