Institutional, government, technological, or economic restrictions on the entry of participants into a market or industry. The four primary barriers to entry are: (1) resource ownership, (2) patents and copyrights, (3) government restrictions, and (2) start-up cost. Barriers to entry are a key reason for market control and the inefficiency that results. 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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It's almost impossible to take a leisurely stroll around the economy without crashing headlong into the federal deficit. It doesn't take a microscope to see it bulging from the windows and doors of the Sylvester J. Peabody Federal Office Building as we pass by. It's a monstrous beast that seems to be growing by the minute. But is the federal deficit really as ghoulish and gruesome as drawn by political cartoonists? Should we make a detour of our pedestrian trek to avoid the beast? Considering it's size, is avoidance even possible. To answer these question, let's consider the pluses and minuses of our federal deficit.
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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for slow moving vehicles with darkened windows.
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