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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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PERFECT COMPETITION, MARGINAL ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This marginal approach is one of three methods that used to determine the profit-maximizing quantity of output. The other two methods involve the direct analysis of economic profit or a comparison of total revenue and total cost.

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Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"The shifts of fortune test the reliability of friends. "

-- Marcus Tullius Cicero, Roman statesman

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