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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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MARGINAL REVENUE, MONOPOLISTIC COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopolistically competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopolistically competitive firm equates marginal revenue and marginal cost.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a coffee cup commemorating the 2000 Olympics or a birthday gift for your grandmother. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"He who truly knows has no occasion to shout. "

-- Leonardo da Vinci, painter, sculptor, architect, engineer

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