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HERFINDAHL-HIRSHMAN 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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AGGREGATE DEMAND AND MARKET DEMAND

The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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Today, you are likely to spend a great deal of time watching the shopping channel seeking to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for small children selling products door-to-door.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"Old age isn't so bad when you consider the alternative. "

-- Cato, Roman orator

GSP
Gross State Product
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