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AMEX: The common abbreviation for the American Stock Exchange, which is one of three national stock markets in the United States (see National Association of Securities Dealers and New York Stock Exchange) that trade ownership shares in corporations. In terms of daily stock transactions and the number of stocks listed, the American Stock Exchange is the smallest of these three. However, it's composite index of stock prices -- AMEX is considered important enough to be flashed briefly on the nightly news.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either high-gloss photo paper that works with your printer or a desktop calendar with all federal and state holidays highlighted. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"Try not to become a man of success but rather to become a man of value. "

-- Albert Einstein

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Journal of Financial Economics
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