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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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RED AGGRESSERINE
[What's This?]
Today, you are likely to spend a great deal of time searching for rummage sales looking to buy either a birthday greeting card for your grandfather or a weathervane with a cow on top. Be on the lookout for gnomes hiding in cypress trees.
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This isn't me! What am I?
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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.
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"Laughter is the shortest distance between two people. " -- Victor Borge, musician, humorist
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MSE
Mean Squared Error
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