An example of a Natural Monopoly would be The London Underground. The cost of digging and maintaining the tunnels in this industry is extremely high. Therefore the industry can only have one firm providing this service.
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Transport for London (TfL) is a local government body responsible for most of the transport network in London, United Kingdom.
London is known for its integrated system, which is owned by Transport for London (TfL), an umbrella government body. Certain services, like bus operations, are franchised to private companies, but still operate within TfL's control.