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PERFECT COMPETITION AND DEMAND: The demand curve for the output produced by a perfectly competitive firm is perfectly elastic at the going market price. The firm can sell all of the output that it wants at this price because it is a relatively small part of the market. As a price taker, the firm has no ability to charge a higher price and no reason to charge a lower one. The market price facing a perfectly competitive firm is also the firm's average revenue and, most importantly, its marginal revenue.

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HERFINDAHL INDEX

A measure of concentration of the production in an industry calculated as the sum of the squares of market shares for each firm. This is one method of summarizing the degree to which an industry is oligopolistic and the concentration of market control held by the largest firms in the industry. Two other measures of industry concentration are the four-firm concentration ratio and the eight-firm concentration ratio.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius trying to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for slightly overweight pizza delivery guys.
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More money is spent on gardening than on any other hobby.
"What gets measured gets done."

-- Peter Drucker, educator

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Accelerated Cost Recovery System
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