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HERFINDAHL-HIRSHMAN 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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FALLACY OF FALSE AUTHORITY

The logical fallacy of arguing that something is "correct" or "true" because an "expert" in an unrelated area says so. This is commonly used by both advertisers, politicians, and anyone who relies an "apparent expert" for the "correct" answers to controversial issues.

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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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