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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction 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 VARIABLE COST

Total variable cost per unit of output, found by dividing total variable cost by the quantity of output. When compared with price (per unit revenue), average variable cost (AVC) indicates whether or not a profit-maximizing firm should shut down production in the short run. Average variable cost is one of three average cost concepts important to short-run production analysis. The other two are average total cost and average fixed cost. A related concept is marginal cost.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a rechargeable battery for your cell phone. Be on the lookout for slow moving vehicles with darkened windows.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"Whenever you see a successful business, someone once made a courageous decision."

-- Peter F. Drucker, business strategist

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International Labor Office
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