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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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ELASTICITY AND DEMAND SLOPE

The slope of a straight-line demand curve, one with a constant slope, has constantly changing elasticity. It includes all five elasticity alternatives--perfectly elastic, relatively elastic, unit elastic, relatively inelastic, and perfectly inelastic. No two points on a straight-line demand curve have the same elasticity.

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GRAY SKITTERY
[What's This?]

Today, you are likely to spend a great deal of time watching the shopping channel wanting to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for cardboard boxes.
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More money is spent on gardening than on any other hobby.
"Be willing to have it so. Acceptance of what has happened is the first step to overcoming the consequences of any misfortune."

-- William James, Psychologist

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Bell Journal of Economics
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