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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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TOTAL-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding total value stating that the marginal IS the slope of the total curve. This mathematical relation between total and marginal surfaces throughout the study of economics, especially utility (total utility and marginal utility), production (total product and marginal product), cost (total cost and marginal cost), and revenue (total revenue and marginal revenue). A related mathematical relation exists between a marginal value and the corresponding average value.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a pair of leather sandals that won't cause blisters or clothing for your kitty cats. Be on the lookout for the last item on a shelf.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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