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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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AVERAGE REVENUE AND MARGINAL REVENUE

A mathematical connection between average revenue and marginal revenue stating that the change in the average revenue depends on a comparison between average revenue and marginal revenue. For perfect competition, with no market control, marginal revenue is equal to average revenue, and average revenue does not change. For monopoly and other firms with market control, marginal revenue is less than average revenue, and average revenue falls.

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GRAY SKITTERY
[What's This?]

Today, you are likely to spend a great deal of time watching infomercials looking to buy either semi-gloss photo paper that works with your neighbor's printer or a birthday gift for your father that doesn't look like every other birthday gift for your father. Be on the lookout for infected paper cuts.
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This isn't me! What am I?

The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"A ship ought not to be held by one anchor, nor life by a single hope. "

-- Epictetus, philosopher

FAO
Food and Agricultural Organization
A PEDestrian's Guide
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