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Monopoly

Characteristics

  • Single seller or dominate firm in the market

  • No close substitutes

  • Significant barriers to entry

  • Price maker

Demand and Revenue curves of a monopoly

截圖 2021-01-11 上午1.36.55.png

Profit maximization for the monopoly = Economic profit & Loss

截圖 2020-09-05 下午7.19.08.png
  • 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)

截圖 2020-09-05 下午7.19.26.png
  • 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

截圖 2020-09-05 下午7.23.15.png
  • 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

  • Occurs where P > MC

Productive Inefficiency

  • Occurs where P > minimum ATC

Ways to reduce Monopoly power

  • 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

截圖 2020-09-05 下午8.02.25.png

*The diagrams / definitions in this website is extracted / Notes are summarized from "Economics for the IB Diploma, 2nd Edition" authored by Ellie Tragakes.

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This site is created in 2020, owned by Rex Hsu 徐唯耀. 

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