The tragedy of the common lands means that the users start from their own self-interest and strive to obtain more benefits, and the price paid is borne by everyone.
According to the above definition, which of the following is not a tragedy of the common lands?
A group of herdsmen graze together on a public grassland. Many herdsmen want to raise more sheep to increase their personal income. As a result, the grassland continues to deteriorate until they can't raise sheep, which eventually leads to the bankruptcy of all herdsmen.