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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 SUPPLY

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

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway looking to buy either a half-dozen helium filled balloons or a packet of address labels large enough for addresses of both the sender and the recipient. Be on the lookout for crowded shopping malls.
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This isn't me! What am I?

Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"Just as iron rusts from disuse, even so does inaction spoil the intellect. "

-- Leonardo da Vinci, architect, artist

AR(N)
A nth-order Autoregressive Process
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