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LRAC CURVE: The common abbreviation for the long-run average cost curve, which is 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 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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MARKET SUPPLY

The combined supply of everyone willing and able to sell a good in a market. Market supply is one half of the market. The other is market demand. It is graphically represented by a positively-sloped market supply curve, which can be derived by combining, or adding, the individual supplies of every seller in the market.

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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 coffee cup commemorating the first day of spring or a printer that works with your stockpile of ink cartridges. Be on the lookout for neighborhood pets, especially belligerent parrots.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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