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Network Externalities

network externalities - when person’s demand depends on someone else’s demands

 

  • positive network externality - to be in style, be like everyone else (bandwagon effect)
    • marketing to make good popular (not banking on low costs, good quality)
    • makes consumer willing to spend more on good only because others do
    • relatively more elastic than neutral network externality
    • general urge to match up to standards of everyone else
  • consistency - quantity consumed by individual must be on demand curve associated w/ other consumers’ demands
    • forms aggregate demand curve (points of consistency where individual demand matches demand of others)
    • assume that others will behave like you >> personal choices can affect others to make choices that come full-circle

bandwagon effect - more often for children's toys  

  • more items initially bought if consumers think a large number of other consumers already have it
  • more people buy product >> larger bandwagon effect
  • more people own a product >> higher intrinsic value
    • firms will produce more goods/services for that particular product
    • ex. ipod
  • makes market demand more elastic
  • individual demand function will have some component proportional to overall market demand
    • yindividual = C + kymarket

If the individual demand function is y = 2 - P/30 - Y/30, where P is the price and Y is the market demand, then find the market demand for 30 consumers.  

  • Y = 30y in this case
    • need to solve for y in terms of P first, and then find Y
  • y = 2 - P/30 - Y/30 = 2 - P/30 - (30y)/30 = 2 - P/30 - y
    • 2y = 2 - P/30
    • y = 1 - P/60
  • Y = 30y = 30(1 - P/60)
    • Y = 30 - P/2

snob effect - negative network externality, desire to own exclusive goods  

  • more people own a product >> no longer unique
  • less items initially bought if consumers think a large number of other consumers already have it
  • makes market demand less elastic
  • individual demand function will also have some component proportional to negative overall market demand
    • yindividual = C - kymarket
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