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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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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a turbo-powered vacuum cleaner or a battery-powered, rechargeable vacuum cleaner. Be on the lookout for small children selling products door-to-door.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"Do not stop thinking of life as an adventure. You have no security unless you can live bravely, excitingly, imaginatively, unless you can choose a challenge instead of a competence. "

-- Eleanor Roosevelt, first lady

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