Monopoly
Characteristics
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Single seller or dominate firm in the market
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No close substitutes
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Significant barriers to entry
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Price maker
Demand and Revenue curves of a monopoly

Profit maximization for the monopoly = Economic profit & Loss

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At the profit maximizing level of output, where MC = MR, the firm is producing at the output level with price Pe and quantity Qmax. At this level of output, the firm is making a profit of Pe * (a-b)

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At the loss minimizing level of output, where MC = MR, the firm is producing at the output level with price Pe and quantity Qmin. At this level of output, the firm is making a loss of Pe * (c-d)
Revenue maximization by the monopolist

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At the revenue-maximizing level of output, where MR = 0, the firm is producing at the output level with price Pr and quantity Qr. At this level output, the firm is making a total revenue fo Pr * Qr
Allocative Inefficiency
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Occurs where P > MC
Productive Inefficiency
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Occurs where P > minimum ATC
Ways to reduce Monopoly power
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Since monopoly is producing at neither allocative efficiency nor productive efficiency, monopoly is not preferable for the society, so the government must find ways to regulate and reduce monopoly power
