Aristotle used monopoly (from Greek mónos, “sole”; poleín, “sell”) to denote a market situation in which there is only a single seller [8]. Technically monopoly means that a single supplier can influence the market price to generate a “monopoly profit” because he will try to fix the offer price above his unit costs. In a perfect market, however, the market price would adjust to the level of the marginal cost, and no supplier or demander would have an opportunity to influence the price.