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July 26, 2024 

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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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AMERICAN STOCK EXCHANGE: One of three national stock markets in the United States (see National Association of Securities Dealers and New York Stock Exchange) that trade ownership shares in corporations. In terms of daily stock transactions and the number of stocks listed, the American Stock Exchange is the smallest of these three. However, it's composite index of stock prices -- AMEX is considered important enough to be flashed briefly on the nightly news.

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AMERICAN STOCK EXCHANGE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2024. [Accessed: July 26, 2024].


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ECONOMIC COST

An alternative term for opportunity cost, which is the highest valued alternative foregone in the pursuit of an activity. Opportunity cost, or economic cost, is one of the most fundamental concepts used in the study of economics, hence the reason it is also termed economic cost. Economic, or opportunity cost is also commonly termed just cost.

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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for telephone calls from former employers.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"Old age isn't so bad when you consider the alternative. "

-- Cato, Roman orator

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