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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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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

     See also | market share | oligopoly | concentration ratio | market control | antitrust laws |


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VOTING RULES

The guidelines followed by groups of individuals or members of society when making collective or joint decisions that involve casting formal indications of choice (that is, votes). The five most noted voting rules are majority, super majority, unanimity, plurality, and weighted. These rules determine if a choice is or is not approved by the voting group. Voting rules are important for the study of public choice and government inefficiencies that arise in the voting process due to the median voter, logrolling, and the voting paradox.

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PINK FADFLY
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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for mail order catalogs with hidden messages.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
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