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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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PERFECT COMPETITION, MARGINAL ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This marginal approach is one of three methods that used to determine the profit-maximizing quantity of output. The other two methods involve the direct analysis of economic profit or a comparison of total revenue and total cost.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway wanting to buy either galvanized steel storage shelves or a large green chalkboard shaped like the state of Maine. Be on the lookout for door-to-door salesmen.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"It is not fair to ask of others what you are unwilling to do yourself. "

-- Eleanor Roosevelt, diplomat, activist

MR
Marginal Revenue
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