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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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PRINCIPLE OF MINIMUM DIFFERENCES

A principle stating that monopolistically competitive firms seek to maintain similarities between products at the same time they promote differences. Similarities enable substitutability, such that one firm can attract the buyers away from other firms. Differences enable uniqueness and market control, such that each firm has market control and is able to charge a higher price than achieved with perfect competition. This principle is also termed Hotelling's paradox.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club hoping to buy either arch supports for your shoes or an AC adapter that works with your MPG player. Be on the lookout for strangers with large satchels of used undergarments.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"How wonderful it is that nobody need wait a single moment before starting to improve the world. "

-- Anne Frank, diarist

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Consumer Price Index-All Urban Consumers
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