Which industries are examples of natural monopolies? Check all that apply.

pipelines

railway lines

supermarkets

electric companies

sporting goods stores

fixed-line telephone companies

Natural monopoly is type of monopoly when only one firm dominates the industry. The reasons for natural monopoly are extremely high fixed costs of distribution. These requirements are exist for example when large-scale infrastructure is required to ensure supply. Examples for natural monopolies are:

railway lines

electric companies

fixed-line telephone companies

All of them in order to give the service have extremely high costs and requirements for infrastructure.