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A monopsony is a market condition in which there is only one buyer, the monopsonist. It is a market structure in which a single buyer substantially controls the market as the major purchaser of goods and services offered by many would-be sellers. An oligopoly is a market structure in which a few firms dominate. When a market is shared between a few firms, it is said to be highly concentrated. A monopoly contains a single firm that produces goods with no close substitute.