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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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EFFECTIVE DEMAND

A key conceptual notion of Keynesian economics stipulating that the aggregate expenditures on real production is based on existing or actual income rather than the income that would be generated with full employment of resources. Effective demand is embodied in the aggregate expenditures line, which has a positive slope, but a slope of less than one. This concept was proposed by Thomas Robert Malthus in the early 1800s as a counter argument to Say's law found in classical economics and then found new life when John Maynard Keynes developed his theory in the 1930s.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for neighborhood pets, especially belligerent parrots.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"Wherever you go, no matter what the weather, always bring your own sunshine."

-- Anthony J. D'Angelo

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