Public utilities are the classic examples of

A) industries with network effects.
B) industries protected by patents.
C) natural monopolies.
D) industries owning a scarce factor of production.

Public Utilities

Entities that provide essential services to the public, such as water, electricity, and natural gas, often under government regulation.

Natural Monopolies

Industries where a single firm can supply the entire market at a lower cost than if there were multiple firms, often due to high fixed costs.