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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 REVENUE AND MARGINAL REVENUE

A mathematical connection between average revenue and marginal revenue stating that the change in the average revenue depends on a comparison between average revenue and marginal revenue. For perfect competition, with no market control, marginal revenue is equal to average revenue, and average revenue does not change. For monopoly and other firms with market control, marginal revenue is less than average revenue, and average revenue falls.

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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for rusty deck screws.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"The ideals that have lighted my way, and time after time have given me new courage to face life cheerfully, have been kindness, beauty and truth. "

-- Albert Einstein, physicist

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