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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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MARGINAL REVENUE CURVE

A curve that graphically represents the relation between the marginal revenue received by a firm for selling its output and the quantity of output sold. A firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve. The marginal revenue curve for a firm with no market control is horizontal. The marginal revenue curve for a firm with market control is negatively sloped and lies below the average revenue curve.

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Today, you are likely to spend a great deal of time searching for a specialty store hoping to buy either a how-to book on wine tasting or a bookshelf that will fit in your closet. Be on the lookout for pencil sharpeners with an attitude.
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The average bank teller loses about $250 every year.
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