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OLIGOPOLY CHARACTERISTICS: The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.

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LAW OF DIMINISHING MARGINAL UTILITY

A principle stating that as the quantity of a good consumed increases, eventually each additional unit of the good provides less additional utility--that is, marginal utility decreases. Each subsequent unit of a good is valued less than the previous one. The law of diminishing marginal utility helps to explain the negative slope of the demand curve and the law of demand.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for pencil sharpeners with an attitude.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"There is a way to look at the past. Don't hide from it. It will not catch you - if you don't repeat it."

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