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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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PERSONAL TAXES

The common term for the portion of personal income used to pay personal tax and nontax payments. Personal tax and nontax payments is the official item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring the personal income taxes paid to the government sector on personal income received by the household sector. Personal tax and nontax payments are subtracted from personal income (PI) to calculate disposable income (DI). Personal tax and nontax payments are about 15 percent of personal income and about 13 percent of gross domestic product.

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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time wandering around the downtown area wanting to buy either a green fountain pen or a handcrafted bird house. Be on the lookout for infected paper cuts.
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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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