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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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UNEMPLOYMENT RATE, MEASUREMENT PROBLEMS

The official unemployment rate, which measures the proportion of the civilian labor force 16 years or older that is not engaged in productive activities but is actively seeking employment, might be either overstated or understated due to discouraged workers, part-time workers, and unreported legal or illegal employment. Taken together, these measurement problems suggest that the official unemployment rate is likely understated during business-cycle contraction and overstated during business-cycle expansions.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for telephone calls from former employers.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
"How we spend our days is, of course, how we spend our lives. "

-- Annie Dillard, essayist

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A nth-order Moving Average Process
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