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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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COMMON-PROPERTY GOODS

Goods characterized by rival consumption and the inability to exclude nonpayers. Common-property goods are one of four types of goods differentiated by consumption rivalry and nonpayer excludability. The other three goods are private (rival consumption and nonpayers can be excluded), public (nonrival consumption and nonpayers cannot be excluded), and near-public (nonrival consumption and nonpayers can be excluded). Nonrival consumption and the ease of excluding of nonpayers means common-property goods cannot be efficiently exchanged through markets and are often overconsumed.

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