Three conditions are necessary for a monopoly position to be established in the market: 1) There must be significant barriers to entry that prevent new competitors from entering the market. These barriers could include high startup costs, proprietary technology, or government regulations. 2) There needs to be no close substitutes for the monopolized good or service. If close substitutes exist, it is difficult to exert monopoly power over price. 3) The monopolized good needs to have a large market share so it can influence the market price. Monopolies are characterized by a single seller dominating an industry.