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OLIGOPOLY CHARACTERISTICS: The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
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