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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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INCOME ELASTICITY OF DEMAND

The relative response of a change in demand to a change in income. More specifically the income elasticity of demand is the percentage change in demand due to a percentage change in buyers' income. This notion of elasticity captures the buyers' income demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the cross elasticity of demand.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either several magazines on time travel or 500 feet of telephone cable. Be on the lookout for pencil sharpeners with an attitude.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Just as iron rusts from disuse, even so does inaction spoil the intellect. "

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