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October 12, 2026 

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HERFINDAHL INDEX: 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 TOTAL COST

Total cost per unit of output, found by dividing total cost by the quantity of output. When compared with price (per unit revenue), average total cost (ATC) indicates the per unit profitability of a profit-maximizing firm. Average total cost is one of three average cost concepts important to short-run production analysis. The other two are average fixed cost and average variable cost. A related concept is marginal cost.

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On The Lookout For A RECESSION

One pitfall facing any pedestrian who explores the intricate details of the economy is large potholes lurking along the path. LOOK OUT! You can probably expect a few bumps and bruises from abruptly introducing your face to the pavement. But, after the cast hardens and the gashes have been stitched, you can be on your way. A little more experienced, no doubt, but forging ahead in spite of it all. Our economy also steps into an occasional pothole in route to an expanding economic pie. Recession is the nifty term we use for this sort of economic pothole and it will be are our topic for the next few pages. OH NO! LOOK OUT!
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YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for pencil sharpeners with an attitude.
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This isn't me! What am I?

The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"Life is not a 'brief candle.' It is a splendid torch that I want to make burn as brightly as possible before handing it on to future generations. "

-- Bernard Shaw, journalist

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