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[判断]The fundamental cause of monopolies is barriers to entry.
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[判断]Copyrights and patents are examples of barriers to entry that give firms monopoly pricing powers.
[判断] Like competitive firms, monopolies choose to produce a quantity in which marginal revenue equals marginal cost.
[判断] At the profit-maximizing quantity of output for a monopolist, average revenue, marginal revenue, and price are all equal.
最为精确的明暗调整方式是（），它可以调节阶调曲线中的任意一点，还可以选择不同的颜色通道来进行调整。(知识点8.1)
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