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BARRIER TO ENTRY: 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 REVENUE

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. Using the longer term average revenue rather than price provides a connection to other related terms, especially total revenue and marginal revenue. When compared with average cost, average revenue indicates the amount of profit generated per unit of output produced. Average revenue is often depicted by an average revenue curve.

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BLUE PLACIDOLA
[What's This?]

Today, you are likely to spend a great deal of time lost in your local discount super center seeking to buy either a half-dozen helium filled balloons or a packet of address labels large enough for addresses of both the sender and the recipient. Be on the lookout for a thesaurus filled with typos.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"The way employees treat customers reflects the manner in which they're treated by management. "

-- James Perkins, president, Cornell University

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Quasi-Maximum Likelihood
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