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HOTELLING'S PARADOX: A principle stating that monopolistically competitive firms seek to maintain similarities between products at the same time they maintain differences. Similarities enable substitutability. That is, one firm can attract the buyers away from other firms. Differences enable uniqueness and market control. That is, a firm has a small monopoly for its product that allows it to charge a higher price than achieved with perfect competition. This is also termed the principle of minimum differences.

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MARGINAL REVENUE, MONOPOLY

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopoly receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopoly equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time at an auction looking to buy either a T-shirt commemorating last Friday (you know why) or a rotisserie oven that can also toast bread. Be on the lookout for poorly written technical manuals.
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John Maynard Keynes was born the same year Karl Marx died.
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