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EFFECTIVE DEMAND: The notion that the actual demand for aggregate output in the macroeconomy is based on the actual income or other existing economic conditions and not on income and conditions existing in equilibrium. The idea of effective demand plays a key role in Keynesian economics and how the macroeconomy can have extended periods of unemployment. Effective demand is in direct contrast to the view underlying classical economics that demand is that existing in equilibrium.
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VARIABLE INPUT An input whose quantity can be changed in the time period under consideration. The most common example of a variable input is labor. Variable inputs provide the means used by a firm to control short-run production. The alternative to variable input is fixed input. 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, which is the law of diminishing marginal returns.
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GRAY SKITTERY
[What's This?]
Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a how-to book on surfing the Internet or a computer that can play music and burn CDs. Be on the lookout for slightly overweight pizza delivery guys.
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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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"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." -- Mark Twain
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EMA
Econometrica
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