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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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LAW OF DIMINISHING MARGINAL RETURNS A principle of short-run production stating that as a firm combines more of a variable input with a fixed input, the marginal product of the variable input eventually declines. This is THE economic principle underlying the analysis of short-run production for a firm. It offers an explanation for the law of supply and the positive slope of the market supply curve.
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John Maynard Keynes was born the same year Karl Marx died.
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"I love the man who can smile in trouble, who can gather strength from distress and grow brave by reflection. " -- Thomas Paine, statesman
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MGF
Moment Generating Function
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