An example of an essential facility is

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An essential facility is a facility or infrastructure that is necessary for other businesses to operate or provide a service. In this case, the telephone line is essential because it enables communication for businesses and individuals alike. Without it, many essential services and functions would not be possible. U.S. Route 66 and the Golden Gate Bridge could also be considered essential facilities for different reasons, but the telephone line is likely the most universally applicable example. The local pizza parlor, in contrast, is not an essential facility as it is not necessary for other businesses or services to function.

An Example of an Essential Facility Is