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MARGIN REQUIREMENT: The fraction of the purchase price of financial investments, like stocks and bonds, that the buyer must pay for in cash. The remaining part of the purchase price can thus be financed with credit.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly 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 perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex looking to buy either 500 feet of telephone cable or a package of 4 by 6 index cards, the ones with lines. Be on the lookout for slow moving vehicles with darkened windows.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects."

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