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CH5 競爭 (market (product, channel, outlet, geographical), Market Definition…

- - - - 小>漲價有利廠商
      - well defined market
        
        SSNIP
        
        所有廠商聯合
        可以漲價5% 維持一年
    - - 大>直接競爭
- - - - Monopoly HI>= 0.6, 1st>70%
      - Oligopoly HI 0.2 ~ 0.6, 1st 40% ~70%
      - Monopolistic Competition HI<0.2, 1st<40%
      - Perfect Competition HI<0.2, 1st<40%
  - - - Monopolist (獨賣); Monopsonist （獨買）
    - - differentiation
        
        Vertical differentiation
        
        With Clear quality difference
        
        Horizontal Differentiation
        
        No clear difference, but some prefer
        
        Spatial Differentiation
    - - :red_flag: Cournot
        Quantity Competition
      - :red_flag: Bertrand
        Price Competition