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MARGINAL REVENUE, MONOPOLISTIC COMPETITION: The change in total revenue received by a monopolistically competitive firm resulting from a change in the quantity of output sold. For a monopolistically competitive firm, marginal revenue is less than the price.

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HERFINDAHL INDEX

A measure of concentration of the production in an industry calculated as the sum of the squares of market shares for each firm. This is one method of summarizing the degree to which an industry is oligopolistic and the concentration of market control held by the largest firms in the industry. Two other measures of industry concentration are the four-firm concentration ratio and the eight-firm concentration ratio.

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Today, you are likely to spend a great deal of time browsing about a thrift store hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for malfunctioning pocket calculators.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"Nothing great has ever been achieved except by those who dared believe that something inside them was superior to circumstances. "

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MC
Marginal Cost
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