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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

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. Using the longer term average revenue rather than price provides a connection to other related terms, especially total revenue and marginal revenue. When compared with average cost, average revenue indicates the amount of profit generated per unit of output produced. Average revenue is often depicted by an average revenue curve.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs looking to buy either clothing for your pet dog or an ink cartridge for your printer. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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