Final answer:
A park is considered a common resource when it is open for public use without a fee but has limited capacity, which can lead to resource depletion or damage, as described by the tragedy of the commons.
Step-by-step explanation:
A park would be considered a common resource under scenarios where it is nonexcludable and rivalrous. This means that the park is open for the public to use without a fee (nonexcludable), but it still has a finite capacity (rivalrous); if too many people use the park, it can become overcrowded, and the quality of the park could diminish. It is similar to the concept of the tragedy of the commons, where individuals, acting independently according to their own self-interest, behave contrary to the common good of all users by depleting or spoiling the shared resource.
The tragedy of the commons illustrates the potential problem with common resources like parks, fisheries, or forests. This concept denotes the situation where individuals use a shared resource so extensively that it becomes unavailable for others and future generations. In the case of a park, without proper management or government regulation, the park could become overused or damaged, leading to environmental degradation and a decrease in its utility for society.