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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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CONSUMPTION The use of resources, goods, or services to satisfy wants and needs. At the macroeconomic level, consumption is reflected as expenditures by the household sector on gross domestic product. At the microeconomic level, consumption is important to utility, demand, and market exchanges. Consumption is the ultimate goal of economic activity.
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Two and a half gallons of oil are needed to produce one automobile tire.
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"How wonderful it is that nobody need wait a single moment before starting to improve the world." -- Anne Frank
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LTFV
Less Than Fair Value
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