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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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SECOND-DEGREE PRICE DISCRIMINATION

A form of price discrimination in which a seller charges different prices for different quantities of a good. This also goes by the name block pricing. Second-degree price discrimination is possible because decidedly different quantities are purchased by different types of buyers with different demand elasticities. This is one of three price discrimination degrees. The others are first-degree price discrimination and third-degree price discrimination.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for malfunctioning pocket calculators.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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