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SHORT-RUN SUPPLY CURVE: For a perfectly competitive firm, the marginal cost curve that lies above the average variable cost curve. This segment of the marginal cost guides a perfectly competitive firm's profit maximizing production as it equates price to marginal cost. Because the marginal cost curve is positively sloped (due to the law of diminishing marginal returns), each firm's supply curve and the market supply curve are also positively sloped. The law of diminishing marginal returns thus provides an explanation for the law of supply. However, this only works for firms with NO market control. Monopoly, monopolistic competition, and oligopoly, with market control, do not achieve the same result.

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FACTOR MARKET ANALYSIS

An analysis of the structure and equilibrium determination of markets that exchange the services of productive resources. This analysis highlights principles and concepts that tend to be most commonly associated with factor markets (also termed resource markets), including monopsony and bilateral monopoly. Marginal revenue product is a key concept on the demand side of the factor market. Marginal factor cost is a key concept on the supply side of the factor market.

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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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