That's not really what a natural monopoly is. In a natural monopoly, the high barrier to entry means it's essentially wasteful to encourage competition. For ex

That's not really what a natural monopoly is. In a natural monopoly, the high barrier to entry means it's essentially wasteful to encourage competition. For example, imagine operating the first power plant in a desert region. If it's expensive to set up power plants, then there won't be much point in encouraging competition; no one else will want to set up one. The operators of the power plant have a natural monopoly. It would be better to spend the resources required for a second power plant on servicing customers elsewhere instead of fighting over the same territory — so the monopoly is "good" in the sense that it disincentivizes a bad allocation of capital. Generally, natural monopolies get regulated (e.g. a power authority blessed by the local government operates the power plant instead of a private firm).