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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (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. These four characteristics mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

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AVERAGE COST

The opportunity cost incurred per unit of good produced. This is calculated by dividing the cost of production by the quantity of output produced. While average cost is a general term relating cost and the quantity of output, three specific average cost terms are average total cost, average variable cost, and average fixed cost. A related cost term is marginal cost.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a computer that can play video games and burn DVDs or a black duffle bag with velcro closures. Be on the lookout for mail order catalogs with hidden messages.
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A half gallon milk jug holds about $50 in pennies.
"If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse and you say that you are neutral, the mouse will not appreciate your neutrality."

-- Desmond Tutu, activist

ARIMA
Autoregressive Integrated Moving Average
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