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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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AGGREGATE DEMAND INCREASE, LONG-RUN AGGREGATE MARKET

A shock to the long-run aggregate market caused by an increase in aggregate demand resulting in and illustrated by a rightward shift of the aggregate demand curve. An increase in aggregate demand in the long-run aggregate market results in an increase in the price level but no change in real production. The level of real production resulting from the aggregate demand shock is full-employment real production.

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APLS

PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time wandering around the shopping mall wanting to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for fairy dust that tastes like salt.
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This isn't me! What am I?

Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"Intense concentration hour after hour can bring out resources in people they didn't know they had. "

-- Edwin Land, inventor, entrepreneur

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Marginal Cost
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