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AD VALOREM TAX: A tax that is specified as a percentage of value. Sales, income, and property taxes are three of the more popular ad valorem taxes devised by government. The total ad valorem tax paid increases with the value of what's being taxed.

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EIGHT-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the eight 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 eight-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 eight largest firms in the industry.

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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a hepa filter for your furnace or a wall poster commemorating next Thursday. Be on the lookout for mail order catalogs with hidden messages.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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