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HERFINDAHL 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 PRODUCT: The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product lies at the very foundation of the analysis of short-run production and the subsequent explanation of the law of supply and the upward-sloping supply curve, using the law of diminishing marginal returns.

     See also | total product | output | input | variable input | fixed input | average product | marginal cost | law of diminishing marginal returns | average-marginal rule | total-marginal rule | short-run production | marginal physical product |


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MARGINAL PRODUCT, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: May 26, 2018].


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CONSUMER CONFIDENCE, AGGREGATE DEMAND DETERMINANT

One of several specific aggregate demand determinants assumed constant when the aggregate demand curve is constructed, and which shifts the aggregate demand curve when it changes. An increase in consumer confidence causes an increase (rightward shift) of the aggregate demand curve. A decrease in consumer confidence causes a decrease (leftward shift) of the aggregate demand curve. Other notable aggregate demand determinants include interest rates, federal deficit, inflationary expectations, and the money supply.

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