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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.
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INSURANCE A service that transfers the risk of loss from an individual to a larger group. The larger group is typically represented by an insurance provider, either a private for-profit company or a government agency. The insurance provider can assume the risk through risk pooling. Risk averse people, who are willing to pay a premium to avoid risk, are the ones most inclined to purchase insurance. The risk averse individual agrees to incur a small guaranteed loss (the premium) but avoids incurring a less likely, but much bigger, loss.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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"My father used to say to me, „Whenever you get into a jam, whenever you get into a crisis or an emergency . . .become the calmest person in the room and you'll be able to figure your way out of it. " -- Rudolph Giuliani
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NBS
Nash Bargaining Solution
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