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ENTRY BARRIER: 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 EXPENDITURES EQUATION An equation that summarizes the four aggregate expenditures on gross domestic product by the four macroeconomic sectors. In the study of Keynesian economics, this equation is commonly used to summarize the demand side of the macroeconomy. The aggregate expenditures equation actually comes in three different versions depending on how many of the four sectors and their expenditures are included.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time lost in your local discount super center hoping to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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"Live in such a way that you would not be ashamed to sell your parrot to the town gossip." -- Will Rogers
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LRMC
Long Run Marginal Cost
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