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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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ECONOMIC COST

An alternative term for opportunity cost, which is the highest valued alternative foregone in the pursuit of an activity. Opportunity cost, or economic cost, is one of the most fundamental concepts used in the study of economics, hence the reason it is also termed economic cost. Economic, or opportunity cost is also commonly termed just cost.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius trying to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for deranged pelicans.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"And while the law of competition may be sometimes hard for the individual, it is best for the race, because it ensures the survival of the fittest in every department. "

-- Andrew Carnegie, entrepreneur

ACCR
Annual Cost of Capital Recovery
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