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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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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time lost in your local discount super center looking to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for small children selling products door-to-door.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"He who hesitates is poor. "

-- Mel Brooks, writer, director, comedian

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