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What is the marginal cost of one more e-book? Let's say that you, the publisher, expected to sell 5,000 copies of a book, but instead, you sold 5,001 copies. How much did that extra book cost you to make available?
My guess is that the cost of supplying 5001 copies minus the cost of supplying 5000 copies is almost zero. Note that proofreading and marketing would not count in this figure, but if the author gets a fixed amount per copy, that would count.
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