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HOTELLING'S RULE: The notion that efficiency and competitive market forces will lead to an increase of scarcity rent of a finite, exhaustible resource that is equal to the interest rate. The logic behind Hotelling's Rule is that as a finite fossil fuel is depleted, less is available in the future, causing scarcity rent, and thus the resource price, to increase. An increase in the resource price reduces the quantity demanded and conserves more for future consumption. When finite, exhaustible resource markets are competitive, this process generates an efficient allocation over time.

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MARGINAL REVENUE

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

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites wanting to buy either blue cotton balls or a genuine down-filled pillow. Be on the lookout for gnomes hiding in cypress trees.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Carpe diem! Rejoice while you are alive; enjoy the day; live life to the fullest; make the most of what you have. It is later than you think."

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