... four types of market structure: Monopoly, oligopoly, perfect competition and monopolistic competition. Another characteristic that determines market structure is the nature of the product that is being produced. The product can be unique or homogenous. The conditions of entry in the market are the third criteria of market structure. These conditions can be from very easy to real difficult to enter the market. Last but not least, the ability of affecting the price of a product is also another important criterion to determine the type of market structure. (Dr. K. D. Traxana, "Oikonomiki Ths Dioikisis- Posotikes Methodoi Epixeirisiakis Lipsis Apofaseon", Ekdoseis A. Stamoulis, Athens, 1994). Monopoly The monopoly market is known as the market where there is just a single seller, which is producing the total amount of the product in the market. For this product there are no close substitutes. Also there are no competitors. So for this branch the firm-seller is the ...

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