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July 18, 2025 

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TIE-IN SALE: A type of sale in which consumers can buy one good only if they purchase another good as well. For example, if your grocery store sells you a bag of tea with the condition that you buy a pound of sugar, that would be a tie-in sale. Because they allow a monopoly to increase its profit over what it could make by selling the two goods separately at constant prices, tie-in sales can be used to price discriminate. However, it is important to realize that there are other reasons for tie-in sales other than price discrimination, such as to increase efficiency. For example, when we buy a car, it comes as a package of several goods (tires, engine, etc), which would be very difficult (and inefficient) for consumers to assemble if they were bought separately.

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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 18, 2025].


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BANK RESERVES

Assets used by banks to back up deposits and to conduct daily transactions, including withdrawing funds, "cashing" checks, and transferring funds between banks to "clear" checks. Reserves, also termed bank reserves or legal reserves, includes two types of assets: vault cash and Federal Reserve deposits. These legal reserves are then divided between require reserves and excess reserves. Required reserves are used to back up deposits and excess reserves are used for loans.

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