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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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MARGINAL FACTOR COST CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between marginal factor cost incurred by a perfectly competitive firm for hiring an input and the quantity of input employed. A profit-maximizing perfectly competitive firm hires the quantity of input found at the intersection of the marginal factor cost curve and marginal revenue product curve. The marginal factor cost curve for a perfectly competitive firm with no market control is horizontal.

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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a flower arrangement with anything but tulips for your grandfather or a birthday greeting card for your mother that doesn't look like a greeting card. Be on the lookout for broken fingernail clippers.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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