When does a natural monopoly arise?

When one firm can efficiently supply the market.

Explanation:

A natural monopoly occurs when the biggest supplier in an industry, usually the leading business in the market, has an overpowering advantage over possible business opponents.

This is usually the case in industries with high infrastructural costs, where capital costs prevail, generating economies of scale that are too big in relation to the dimension of the market.

how do you know that

explanation:

the answer to this question is d