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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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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 at a going out of business sale seeking to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for letters from the Internal Revenue Service.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Just as iron rusts from disuse, even so does inaction spoil the intellect. "

-- Leonardo da Vinci, architect, artist

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