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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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MIDPOINT ELASTICITY FORMULA A simple technique for calculating the coefficient of elasticity by estimating the average elasticity for discrete changes in two variables. The distinguishing characteristic of this formula is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than initial values. An alternative technique is the endpoint elasticity formula.
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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either a large stuffed brown and white teddy bear or a replacement washer for your kitchen faucet. Be on the lookout for rusty deck screws.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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"The greatest use of life is to spend it for something that will outlast it." -- William James, psychologist
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MR
Marginal Revenue
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