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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 VARIABLE COST CURVE

A curve that graphically represents the relation between average variable cost incurred by a firm in the short-run product of a good or service and the quantity produced. This curve is constructed to capture the relation between average variable cost and the level of output, holding other variables, like technology and resource prices, constant. The average variable cost curve is one of three average curves. The other two are average total cost curve and average fixed cost curve. A related curve is the marginal cost 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 storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"In a time of drastic change, it is the learners who inherit the future. "

-- Eric Hoffer, philosopher

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