Goods that are excludable and non-rivalrous.
Shared good that is available to all members of a community.
A good that is accessible to all individuals, but requires payment or special access.
An individual who consumes more of a common good, decreasing the opportunity of another individual to consumer their proportionate share.
A good that can be limited and therefore exclusive, and available for only limited consumption, and therefore rivalrous.
A good that is considered both non-rivalrous and non-exclusive.
Once a good is consumed, it is no longer available for consumption by another individual.