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MARGINAL REVENUE CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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POINT ELASTICITY

The relative responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve.

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Today, you are likely to spend a great deal of time wandering around the shopping mall hoping to buy either a wall poster commemorating the 2000 Olympics or a flower arrangement with a lot of roses for your grandmother. Be on the lookout for pencil sharpeners with an attitude.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"I think luck is the sense to recognize an opportunity and the ability to take advantage of it . The man who can smile at his breaks and grabs his chance gets on."

-- Samuel Goldwyn, Film executive

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