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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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CONSUMPTION RIVALRY

Whether or not the consumption of a particular good by one person prevents simultaneous consumption by another person. In other words, does consumption impose an opportunity cost on others. Rival consumption occurs if the consumption by one imposes an opportunity cost on others because others are prevented from consuming the good. Nonrival consumption occurs if the consumption by one does not impose an opportunity cost on others because others are not prevented from consuming the good. When combined with nonpayer excludability, the result is four alternative types of goods -- private, public, common-property, and near-public.

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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a remote controlled sports car with an air spoiler or semi-gloss photo paper that works with your neighbor's printer. Be on the lookout for slow moving vehicles with darkened windows.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"If I have ever made any valuable discoveries, it has been owing more to patient attention than to any other talent. "

-- Isaac Newton, mathematician, physicist

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