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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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EXCHANGE RATE POLICIES

Policies undertaken by domestic governments often in conjunction with international financial organizations to control exchange rates through foreign exchange markets. The three most common exchange rate policies are flexible exchange rates, fixed exchange rates, and managed flexible exchange rates. Flexible exchange rates are allowed to adjust through unrestrained forces of demand and supply in the foreign exchange market. Fixed exchange rates are established at a given level. Managed flexible exchange rates are allowed to change within boundaries, but subject to control if they change too much.

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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.
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