Basic purpose of this article is to Define and Discuss on Costs of Monopoly. Here explain Costs of Monopoly in economics point of view with figure and example. A monopolist produces less end result and sells it with a higher price than the perfectly competitive firm. The monopolist’s behavior is costly on the consumers who demand the particular monopolist’s output. The cost on the consumer of a monopolistic market structure could be the reduction in consumer surplus that results from monopoly end result and price decisions.