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CHANGE IN AGGREGATE SUPPLY: A shift of the short-run or long-run aggregate supply curve caused by a change in one of the aggregate supply determinants. In essence, a change in aggregate supply is caused by any factor affecting supply EXCEPT the price level. This concept should be contrasted directly with a change in real production. You might also want to review the terms change in quantity supplied and change in supply, as well. The change in aggregate supply is comparable to the change in market supply. A change in aggregate supply is a change in ALL price level-real production combinations, meaning that each price level is matched up with a different level of real production (which is then illustrated as a shift of the short-run or long-run aggregate supply curve). This change in aggregate supply is caused by a change in any of the aggregate supply determinants. In contrast, a change in real production is a change from one price level-real production combination to the another.

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MARGINAL EFFICIENCY OF INVESTMENT: The anticipated rate of return on a capital investment project undertaken by a business firm. Businesses typically compare the marginal efficiency of investment, abbreviated MEI, on physical capital with interest rate returns on financial capital when deciding to undertake an investment project. Because different investment projects have different returns, businesses often have a range of alternatives projects from which to choose. Combining all projects throughout the economy gives rise to an investment demand curve relating investment expenditures to the interest rate.

     See also | investment expenditures | business sector | capital | physical capital | financial capital | rate of return | investment demand curve | interest rate | internal rate of return |


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MARGINAL EFFICIENCY OF INVESTMENT, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 5, 2025].


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NOBEL PRIZE IN ECONOMIC SCIENCES

An award given annually since 1969 to an economist or scholar in recognition of a major contribution to the study of economics. It was established by the Bank of Sweden and is annually awarded by the Royal Swedish Academy of Sciences in Stockholm. The official name of the award is The Bank of Sweden Prize in Economic Sciences in Memory of Alfred Nobel. It is the only Nobel Prize awarded for a social science. The first Nobel Prize in Economic Sciences was awarded in 1969 to Ragnar Frisch and Jan Tinbergen.

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