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October 18, 2018 

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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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MONOPSONY: A market characterized by a single buyer of a product. Monopsony is the buying-side equivalent of a selling-side monopoly. Much as a monopoly is the only seller in a market, monopsony is the only buyer. While monopsony could be analyzed for any type of market it tends to be most relevant for factor markets in which a single firm is the only buyer of a factor.

     See also | factor markets | monopoly | bilateral monopoly | price maker | efficiency | allocation | monopsony and efficiency |


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MONOPSONY, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: October 18, 2018].


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ADVERSE SELECTION

An inefficient, bad, or adverse outcome of a market exchange that results because buyers and/or sellers make decisions based on asymmetric information. This commonly results in a market that exchanges a lesser quality good, what is termed the market for lemons. Two related problems resulting from asymmetric information are moral hazard and the principal-agent problem. Two methods of lessoning the problem of adverse selection are signalling and screening.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a cell phone case or a pair of designer sunglasses. Be on the lookout for the last item on a shelf.
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