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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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DERIVED DEMAND

The notion that the demand for a factor of production, or an input used in the production of a good, depends on the demand for the output being produced. This concept highlights the two key aspects of factor demand. One is that factor demand depends on the value of the good being produced. Inputs that produce more valuable outputs are themselves more highly valued. Two is that factor demand depends on the productivity of the input. Inputs that produce more output are themselves more highly valued.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a pair of leather sandals that won't cause blisters or clothing for your kitty cats. Be on the lookout for rusty deck screws.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"So many of our dreams at first seem impossible, then they seem improbable, and then when we summon the will, they soon become inevitable."

-- Christopher Reeve, Actor

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