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REALISM OF PERFECT COMPETITION: 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 a one or two of the four key characteristics of perfect competition, none matches all four sufficiently that we can declare a perfectly competitively industry. 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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RETURNS TO SCALE Changes in production the occur when all resources are proportionately changed in the long run. Returns to scale come in three forms--increasing, decreasing, or constant based on whether the changes in production are proportionally more than, less than, or equal to the proportional changes in inputs. Returns to scale are the guiding principle for long-run production, playing a similar role that the law of diminishing marginal returns plays for short-run production.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for door-to-door salesmen.
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This isn't me! What am I?
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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.
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"Success is liking yourself, liking what you do, and liking how you do it." -- Maya Angelou, Poet and Author
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LPG
Liquid Petroleum Gas
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