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LOCATION THEORY: A theoretical framework for studying the location decisions made of firms and households based on transportation cost and spatial differences in the accessibility of inputs and markets for outputs. Location theory, developed with noted contributions from August Losch, Alfred Weber, Johann von Thunen, Walter Christaller, and Walter Isard, explicitly considers the cost of transportation in the production and consumption choices made by firms and households. Location theory has been used to explain urban density, labor migration, and land use.

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PERFECT COMPETITION, REALISM

Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either hand lotion, a big bottle of hand lotion or a lighted magnifying glass. Be on the lookout for strangers with large satchels of used undergarments.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"The secret of a good memory is attention, and attention to a subject depends upon our interest in it. We rarely forget that which has made a deep impression on our minds. "

-- Tyron Edwards, theologian

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Quasi-Maximum Likelihood
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