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ENTRY BARRIER: 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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AVERAGE FACTOR COST

Total factor cost per unit of factor input employed by a firm in the production of output, found by dividing total factor cost by the quantity of factor input. Average factor cost, abbreviated AFC, is generally equal to the factor price. However, using the longer term average factor cost makes it easier to see the connection to related terms, including total factor cost and marginal factor cost.

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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for the last item on a shelf.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"I do not believe in a fate that will fall on us no matter what we do. I do believe in a fate that will fall on us if we do nothing. "

-- Ronald Reagan, 40th US president

MA(N)
A nth-order Moving Average Process
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