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TRANSACTION COSTS: The costs that arise when dealing or trading with others that are beyond the price. These include the costs of negotiating, writing and enforcing contracts. When buying or selling securities for example, transaction costs include brokers' commissions and dealers' spreads.

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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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A half gallon milk jug holds about $50 in pennies.
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