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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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COMPETITION

In general, the actions of two or more rivals in pursuit of the same objective. In an economic context, the specific objective pursued is usually either selling goods to buyers or buying goods from sellers.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a cell phone case or a pair of designer sunglasses. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"A man is not finished when he is defeated. He is finished when he quits. "

-- President Richard Nixon

MSE
Mean Square Error
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