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QUASI-RENT: The payment that is received by a resource of production activity over the opportunity cost in the short run. The notion of quasi-rent is similar to economic rent, or economic profit, which is payment or revenue received over opportunity cost. The key difference is that quasi-rent is a short-run phenomenon. While quasi-rent is "extra" payment received in the short run, such payment might be essential to keep the resource or production activity in the long run. An example is the quasi-rent received due to the patent on a technological innovation. In the short run, the revenue received can be considered as profit in excess of the opportunity cost of production. However, in the long run this extra revenue motivates innovators to develop new technology. Without quasi-rent the innovations would not occur.

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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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