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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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PROFIT

Generally speaking, the difference between revenue received by a firm for production and cost incurred in the production, or the excess of revenue over cost. Three specific notions of profit exist, each with a different meaning. Accounting profit is the difference between revenue and accounting cost. Economic profit is the difference between revenue and total opportunity cost. Normal profit is opportunity cost of entrepreneurship. Profit is occasionally used synonymously with the term rent, or economic rent.

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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for attractive cable television service repair people.
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The average length of a "business lunch" is about 36 minutes.
"There is no point at which you can say, „Well, I'm successful now. I might as well take a nap.¾"

-- Carrie Fisher, actress, writer

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