Examlex
Describe the two categories of drift.
Common Resources
Natural or man-made resources that are not owned by anyone, tend to be overused or depleted, and are difficult to exclude people from using.
Public Goods
Goods that are non-excludable and non-rivalrous, meaning they can be used simultaneously by more than one person without diminishing availability to others.
Private Goods
Goods that are excludable and rival in consumption, meaning their use by one person prevents use by another.
Nonrival
A characteristic of a good whereby one person's consumption does not diminish the availability of that good for consumption by others.
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