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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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LONG-RUN MARGINAL COST

The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is an increment of the corresponding total. It is the change in long-run total cost divided by, or resulting from, a change in quantity. Long-run marginal cost is guided by returns to scale rather than marginal returns.

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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either clothing for your pet iguana or a set of hubcaps. Be on the lookout for small children selling products door-to-door.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"Lord, where we are wrong, make us willing to change; where we are right, make us easy to live with. "

-- Peter Marshall, US Senate chaplain

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