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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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U-SHAPED COST CURVES

The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. Each is U-shaped because it begins with relatively high but falling cost for small quantities of output, reaches a minimum value, then has rising cost at large quantities of output. Although the average fixed cost curve is not U-shaped, it is occasionally included with the other three just for sake of completeness.

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time looking for a downtown retail store wanting to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for telephone calls from former employers.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"Do not think a man has done his full duty when he has performed the work assigned him. A man will never rise if he does only this. Promotion comes from exceptional work. "

-- Andrew Carnegie, industrialist

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