Which of the following is not a type of market structure?

Competitive monopoly
Oligopoly
Perfect competition
All of the above are types of market structures

The correct answer is: A. Competitive monopoly

A competitive monopoly is not a type of market structure because it is a contradiction in terms. A monopoly is a market structure in which there is only one seller of a good or service. A competitive market is a market structure in which there are many sellers of a good or service. It is not possible for there to be both a monopoly and competition in the same market.

An oligopoly is a market structure in which there are a few large sellers of a good or service. The sellers in an oligopoly have a great deal of market power, which means that they can control the prices of their products.

Perfect competition is a market structure in which there are many sellers of a good or service, the products of the sellers are identical, and the sellers have no market power. In a perfectly competitive market, the price of a good or service is determined by the forces of supply and demand.

I hope this helps!