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@axel77
yeah but the essential point is that the number of books per year is not 5 its 5 billion. So the marginal cost will dominate. And so yes the question is answerable with a finger flick.
@AZ
Even if you keep throwing away your reader after a couple of years, you will still read on the order of a 100 books/zines whatever on them, which means that the number of readers needing to be produced will be two orders of magnitude smaller than the number of books.
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