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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, MONOPOLISTIC COMPETITION

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a monopolistically competitive firm average revenue is greater than marginal revenue. Average revenue for a monopolistically competitive firm is often depicted by a negatively-sloped average revenue curve.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Lombard Street is London's equivalent of New York's Wall Street.
"Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment."

-- Grenville Kleiser, Author

PHLX
Philiadelphia Stock Exchange
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