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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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SUPPLY BY A FIRM

The range of quantities of a factor that a firm is willing and able to sell at a range of factor prices. Supply by a firm is a phrase that is most relevant to the study of factor markets, especially when contrasted with supply to a firm. Supply by a firm puts the firm on the selling side of the factor market. Supply to a firm puts the firm on the buying side of the factor market.

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