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P-E RATIO: Also termed the price-earnings ratio, this is the ratio of the current price for one share of corporate stock to the earnings (profit) per share of stock. This is used by many financial analysts and investors as an indicator of a company's performance and potential for future growth. A relatively high price-earnings ratio suggests that investors think the company has a great deal of future growth potential. It can also be a sign, however, that the company is seriously overpriced and due for a big drop.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Junk bonds are so called because they have a better than 50% chance of default, carrying a Standard & Poor's rating of CC or lower.
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