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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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MARKET ADJUSTMENT

The economic analysis of changes in market equilibrium caused by changes in any of the five demand determinants and/or the five supply determinants. Market adjustment comes in one of eight varieties, given that the two curves comprising the market (demand curve and supply curve) can either increase or decrease, individually or simultaneously. Four adjustments involve a shift of EITHER the demand curve OR the supply curve. The other four adjustments involve shifts of BOTH the demand curve AND the supply curve.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex looking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for small children selling products door-to-door.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
"Seek always to do some good, somewhere. Every man has to seek in his own way to realize his true worth. You must give some time to your fellow man. For remember, you donžt live in a world all your own. Your brothers are here too. "

-- Albert Schweitzer, humanitarian

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