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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) 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, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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PRICE ELASTICITY OF DEMAND

The relative response of a change in quantity demanded to a change in price. More specifically the price elasticity of demand is the percentage change in quantity demanded due to a percentage change in price. This notion of elasticity captures the demand side of the market. A comparable elasticity on the supply side is the price elasticity of supply. Other notable demand elasticities are income elasticity of demand and cross elasticity of demand.

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Today, you are likely to spend a great deal of time at a flea market wanting to buy either galvanized steel storage shelves or a large green chalkboard shaped like the state of Maine. Be on the lookout for gnomes hiding in cypress trees.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"Expect people to be better than they are; it helps them to become better. But don't be disappointed when they're not; it helps them to keep trying."

-- Merry Browne, Author

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International Bank for Reconstruction and Development
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