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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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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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This isn't me! What am I?

Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"I was always looking outside myself for strength and confidence, but it comes from within. It is there all the time. "

-- Anna Freud, psychologist

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