Once again, in both monopolistic and oligopolistic market structures there is no freedom of entry and in both the firms involved have some control over the price. In both monopolistic and perfectly competitive market structures, we have many sellers and buyers. Monopolistic and perfect competition market structures we also have easy entry and therefore fewer barriers to entry exist and exist. When contrasting market structures, the monopoly structure is different from others in that it has only one seller or producer. It is also in a monopoly structure where only a single seller enjoys the profits alone. Oligopoly is different from other structures as it is only where we have sellers who can cooperate together as forming cartels means they are ready to communicate so as to control the price of the product. The perfect competition market structure is different from others as it is only where both sellers and buyers have perfect knowledge of the market. The structure of the market I