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LONG-RUN AVERAGE COST CURVE: A curve depicting the per unit cost of producing a good or service in the long run when all inputs are variable. The long-run average cost curve (usually abbreviated LRAC) can be derived in two ways. On is to plot long-run average cost, which is, long-run total cost divided by the quantity of output produced. at different output levels. The more common method, however, is as an envelope of an infinite number of short-run average total cost curves. Such an envelope is base on identifying the point on each short-run average total cost curve that provides the lowest possible average cost for each quantity of output. The long-run average cost curve is U-shaped, reflecting economies of scale (or increasing returns to scale) when negatively-sloped and diseconomies of scale (or decreasing returns to scale) when positively sloped. The minimum point (or range) on the LRAC curve is the minimum efficient scale.

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PRICE DISCRIMINATION

The act of selling the same good to different buyers for different prices that are not justified by different production costs. This is practiced by suppliers who have achieved some degree of market control, especially monopoly. Common examples of price discrimination are electricity rates, long-distance telephone charges, movie ticket prices, airplane ticket prices, and assorted child or senior citizen discounts. Price discrimination takes the form of one of three degrees: (1) first degree, in which each price is the maximum price that buyers are willing and able to pay, (2) second degree, in which price is based on the quantity sold, and (3) third degree, in which prices are based on an easily identifiable characteristic of the buyer.

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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 wanting to buy either a graduation present for your niece or nephew or a toaster oven that has convection cooking. Be on the lookout for attractive cable television service repair people.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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