Distinguish between natural and artificial monopolies

An artificial monopoly is a monopoly created by law, for example, the state makes an arrangement with a specific post service, making it the main or the only postal service in the country.

A natural monopoly is a monopoly that is no enforced but which emerges due to high infrastructure costs, so for example the infrastructure of water supply makes the company who built the pipes the monopoly.

River arrow on this map is pointing

Japan's government is dictatorship.