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DEMAND SPACE: The area on or beneath a demand curve. Buyers are willing and able to purchase any demand price-quantity demanded combination that places them on or below the demand curve, but not above. The reason is that the demand curve represents the maximum demand price for a given quantity demanded or the maximum quantity demanded for a given demand price.

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BARRIERS TO ENTRY

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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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either throw pillows for your bed or a package of blank rewritable CDs. Be on the lookout for crowded shopping malls.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects."

-- Alexis de Tocqueville, Statesman

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