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April 27, 2015 

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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.

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MARGINAL PROPENSITY TO CONSUME: The proportion of each additional dollar of household income that is used for consumption expenditures. Or alternatively, this is the change in consumption expenditures due to a change in disposable income. Abbreviated MPC, the marginal propensity to consume is the slope of the consumption or propensity-to-consume line that forms the foundation for Keynesian economics. As such, it also takes center stage for the slope of the aggregate expenditure line and the multiplier effect. The sum of the marginal propensity to consume and the related concept, the marginal propensity to save, is equal to one.

     See also | consumption expenditures | disposable income | consumption line | Keynesian economics | multiplier | aggregate expenditures line | marginal propensity to save | marginal propensity to import | marginal propensity to invest |


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MARGINAL PROPENSITY TO CONSUME, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2015. [Accessed: April 27, 2015].


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MARGINAL REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between the marginal revenue received by a monopoly for selling its output and the quantity of output sold. Because a monopoly is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopoly maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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State of the ECONOMY

U.S. Exports
October 2014
$197.5 billion
Up 1.2% from Sept. 2014: Econ. Stat. Admin.

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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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