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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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RESOURCE QUANTITY, AGGREGATE SUPPLY DETERMINANT

One of three categories of aggregate supply determinants assumed constant when the short-run and long-run aggregate supply curves are constructed, and which shifts both aggregate supply curves when it changes. An increase in a resource quantity causes an increase (rightward shift) of both aggregate supply curves. A decrease in a resource quantity causes a decrease (leftward shift) of both aggregate supply curves. The other two categories of aggregate supply determinants are resource quality and resource price. Specific determinants falling into this general category include population, labor force participation, capital stock, and exploration. Anything affecting the quantity of labor, capital, land, and entrepreneurship is also included.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Believe one who has tried it. "

-- Virgil, Roman poet

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