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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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QUANTITY SUPPLIED The specific quantity of a good that sellers are willing and able to sell at a specific supply price. The key word is "specific." Quantity supplied and supply price form matched pairs--one quantity, one price. The combination of all price-quantity pairs is then what constitutes supply. The supply curve is a plot of the quantity supplied at each supply price.
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WHITE GULLIBON
[What's This?]
Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for attractive cable television service repair people.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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"No task is a long one but the task on which one dare not start: It becomes a nightmare. " -- Charles Baudelaire, poet-critic
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Y
Income, Nominal Gross National Product
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