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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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TAX INCIDENCE

The portion of a tax paid by each side of a market based on differences in the pre-tax equilibrium price and the after-tax demand price and supply price. Because a tax drives a wedge between demand price and supply price, the incidence or burden of a tax typically falls on both buyers and sellers. How much each side pays depends on the relative price elasticity of demand and supply. Buyers pay the entire tax only in the case of a perfectly elastic supply or perfectly inelastic demand. Sellers pay the entire tax only in the case of a perfectly elastic demand or perfectly inelastic supply.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for defective microphones.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"An organization's ability to learn, and translate that learning into action rapidly, is the ultimate competitive business advantage. "

-- Jack Welch, General Electric chief executive

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