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Not really definitive answerable, suppose I have following mini-economy.
Total needs of this economy is 5 product units per year
Costs for technology A:
Marginal: 5$ per unit
Infrastructure: 10$ per year.
Total costs: 5*5$ + 10$: 35$ a year
Costs for technology B:
Marginal: 1$ per unit
Infrastructure: 40$ per year
Total costs: 5*1 + 40 = 45$ a year..
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Just to explain as example. It really boils down to how much environment damage does the eInk device including batteries in construction and destruction take? This is a question you cannot answer with a finger flick.
Also you have secondard effects, like less paper books, is less recycleable material, is more wood use on other paper products, like toiletpaper.
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