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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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Lesson 20: Oligopoly | Unit 2: Structure
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Page: 10 of 24
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In this unit, you should have learned about:- How oligopoly is characterized by significant concentration that is indicated by market share, the concentration ratio, or the Herfindahl index.
- The concentration ratio, which is the proportion of total sales accounted for by the top firms in the industry, as one measure of concentration in an oligopoly market.
- How 4-firm and 8-firm concentration ratios calculated and are used to indicate high, medium, and low level concentration in an industry.
- The Herfindahl index, which is the sum of the squares of market shares of the firms in the industry, as another measure of concentration in an oligopoly market.
- How the Herfindahl index is calculated and used to indicate high, medium, and low level concentration in an industry.
- How oligopoly is also characterized by high entry barriers, including start up cost, resource ownership, decreasing average cost, government authorization, and trade barriers.
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INFERIOR GOOD A good for which a change in income causes an opposite change in demand. That is, an increase in income causes a decrease in demand and a decrease in income causes an increase in demand. The income elasticity of demand for an inferior good is negative. An inferior good is one of two alternatives falling within the buyers' income demand determinant. The other is a normal good.
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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway looking to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for slow moving vehicles with darkened windows.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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"Sometimes when you innovate, you make mistakes. It is best to admit them quickly and get on with improving your other innovations. " -- Steve Jobs, Apple Computer founder
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AAT
Association of Accounting Technicians
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