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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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AVERAGE PRODUCT AND MARGINAL PRODUCT

A mathematical connection between average product and marginal product stating that the change in the average product depends on a comparison between the average product and marginal product. If marginal product is less than average product, then average product declines. If marginal product is greater than average product, then average product rises. If marginal product is equal to average product, then average product does not change.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either throw pillows for your living room sofa or a hepa filter for your furnace. Be on the lookout for poorly written technical manuals.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"Concentration is the secret of strength in politics, in war, in trade, in short in all management of human affairs. "

-- Ralph Waldo Emerson, philosopher, poet

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