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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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DEMAND SPACE

The area on or beneath a demand curve that indicates all possible price-quantity combinations acceptable to buyers. Buyers are willing and able to purchase any price-quantity combination that places them on or below the demand curve, but not above.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time at an auction looking to buy either a replacement washer for your kitchen faucet or a stretchable, flexible watch band. Be on the lookout for deranged pelicans.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"Advice is like snow ‚ the softer it falls, the longer it dwells upon and the deeper it sinks into the mind. "

-- Samuel Taylor Coleridge, poet

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