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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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AVERAGE REVENUE PRODUCT AND MARGINAL REVENUE PRODUCT

A mathematical connection between average revenue product and marginal revenue product stating that the change in the average revenue product depends on a comparison between the average revenue product and marginal revenue product. If marginal revenue product is less than average revenue product, then average revenue product declines. If marginal revenue product is greater than average revenue product, then average revenue product rises. If marginal revenue product is equal to average revenue product, then average revenue product does not change.

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Today, you are likely to spend a great deal of time wandering around the downtown area hoping to buy either a package of 3 by 5 index cards, the ones without lines or a blue mechanical pencil. Be on the lookout for letters from the Internal Revenue Service.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"We tend to forget that happiness doesn't come as a result of getting something we don't have, but rather of recognizing and appreciating what we do have."

-- Fredrick Koeing

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