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HOTELLING'S PARADOX: A principle stating that monopolistically competitive firms seek to maintain similarities between products at the same time they maintain differences. Similarities enable substitutability. That is, one firm can attract the buyers away from other firms. Differences enable uniqueness and market control. That is, a firm has a small monopoly for its product that allows it to charge a higher price than achieved with perfect competition. This is also termed the principle of minimum differences.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for broken fingernail clippers.
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