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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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PRINCIPLE

A generally accepted, verified, proven, fundamental law of nature. A principle captures a cause-and-effect relation about the workings of the world that has been tested and verified through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic principles.

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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 really, really exciting, action-filled video game or a coffee cup commemorating the moon landing. Be on the lookout for strangers with large satchels of used undergarments.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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MRS
Marginal Rate of Substitution
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