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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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LABOR

The mental and physical human efforts used in the production of goods and services. This is one of four basic categories of resources, or factors of production. The other three are capital, land, and entrepreneurship.

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Today, you are likely to spend a great deal of time surfing the Internet seeking to buy either rechargeable batteries or a rechargeable battery for your computer. Be on the lookout for the happiest person in the room.
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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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International Trade Organization
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