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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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VERTICAL MERGER

The consolidation of two or more separately-owned businesses, that have an input-output relation, into a single firm. This is one of three types of mergers. The other two are horizontal merger--two competing firms in the same industry that sell the same products--and conglomerate merger--two firms in separate, unrelated industries.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a how-to book on wine tasting or a bookshelf that will fit in your closet. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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