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November 14, 2026 

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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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REDUNDANT INFORMATION

Information received by the five senses (sight, sound, taste, touch, and smell) that is old, familiar, and usual. Because redundant information is not presumed to be threatening it can be largely ignored by the automatic response that is commonly termed the "fight or flight" reaction. The alternative is novel information, which is unfamiliar and potentially threatening.

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BLACK DISMALAPOD
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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 wanting to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for defective microphones.
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The average bank teller loses about $250 every year.
"Every time you win, it diminishes the fear a little bit. You never really cancel the fear of losing; you keep challenging it. "

-- Arthur Ashe, tennis player

EGARCH
Exponential Generalized Autoregressive Conditional Heteroskedasticity
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