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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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THEORY

An empirically verified, interrelated body of general principles, axioms, and assumptions that is used to explain and understand real world phenomena. Theories are the cornerstone of the scientific method. They generate the hypotheses that are verified against real world data. The construction and refinement of theories, accomplished through the hypothesis verification process, is the primary goal of doing science.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either throw pillows for your bed or a package of blank rewritable CDs. Be on the lookout for gnomes hiding in cypress trees.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"One person with a belief is equal to a force of ninety-nine with only interests."

-- John Stuart Mill

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