Public Goods:Goods that are non-rival and non-excludable, meaning that one person's consumption of the good does not reduce its availability to others, and it is difficult to prevent people from accessing the good.
Collective Action Problem: A situation where individuals, acting independently and rationally, will not act in the best interests of the whole group, leading to suboptimal outcomes.
Tragedy of the Commons:A situation where individuals, acting independently and solely in their own self-interest, will ultimately deplete or destroy a shared resource, even when it is not in anyone's long-term interest for this to happen.