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VARIABLE INPUT: An input whose quantity can be changed in the time period under consideration. This should be immediately compared and contrasted with fixed input. The most common example of a variable input is labor. A variable input provides the extra inputs that a firm needs to expand short-run production. In contrast, a fixed input, like capital, provides the capacity constraint in production. As larger quantities of a variable input, like labor, are added to a fixed input like capital, the variable input becomes less productive. This is, by the way, the law of diminishing marginal returns.
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RESERVE REQUIREMENTS Rules established and enforced by the Federal Reserve System governing the amount of reserves (vault cash and Federal Reserve deposits) that banks must keep to back up their deposits. Reserve requirements help to maintain a stable banking system and ensure that banks are able to conduct day-to-day check-clearing and cash-withdrawal transactions. These requirements are also one of the three monetary policy tools that the Fed can use, in principle, to control the money supply. The other two are open market operations and the discount rate.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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"The only profit center is the customer. " -- Peter Drucker, management consultant
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NLLS
Nonlinear Least Squares
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