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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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ECONOMIC ANALYSIS

The process of investigating economic phenomena in a systematic manner. In one sense, this is the heart and soul of the economic discipline. While economists spend an ample time identifying economic concepts, the end result of this discovery process is usually aimed at combining these concepts in such a way as to evaluate or analyze alternative consequences.

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Today, you are likely to spend a great deal of time searching the newspaper want ads wanting to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for broken fingernail clippers.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"I believe that every right implies a responsibility, every opportunity, an obligation, every possession, a duty. "

-- John D. Rockefeller, industrialist

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Generalized Method of Moments
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