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FACTOR DEMAND ELASTICITY: The elasticity of a factor demand curve is affected by four things: (1) the price elasticity of demand for the good produced, (2) the production function technology and elasticity of marginal physical product, (3) the ease of factor substitutability, and (4) the share of the factor's cost relative to total cost. Changes in any of these four items can cause the price elasticity of factor demand to change. In other words, the quantity of factor services demanded will become more or less sensitive to changes in the factor price.

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PERFECT COMPETITION, EFFICIENCY

Perfect competition is an idealized market structure that achieves an efficient allocation of resources. This efficiency is achieved because the profit-maximizing quantity of output produced by a perfectly competitive firm results in the equality between price and marginal cost. In the short run, this involves the equality between price and short-run marginal cost. In the long run, this is seen with the equality between price and long-run marginal cost at the minimum efficient scale of production.

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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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