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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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COMPENSATING WAGE DIFFERENTIALS

Different wages paid to different workers or in different markets that adjust for differences in the jobs or in the productivity of the workers. Wage differentials occur for many reasons. Quite often they are the result of the personal preferences of workers. In some cases workers are willing to "buy" leisure-time or other types of household production by taking lower wages. Differences in job risks, education, and location are also reasons for the persistence of wage differentials.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for attractive cable television service repair people.
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A half gallon milk jug holds about $50 in pennies.
"Something in human nature causes us to start slacking off at our moment of greatest accomplishment. As you become successful, you will need a great deal of self-discipline not to lose your sense of balance, humility and commitment."

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