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HERFINDAHL INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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ENTREPRENEURSHIP

A special sort of human effort that takes on the risk of bringing labor, capital, and land together and organizing production. This is one of four basic categories of resources, or factors of production. The other three are labor, capital, and land.

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Today, you are likely to spend a great deal of time at an auction wanting to buy either shoe laces for your snow boots or a rim for your spare tire. Be on the lookout for jovial bank tellers.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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