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This article apparently sets forth what Rich and/or the publishers and consultants that were interviewed who work with the publishing industry would have us believe are the costs associated with publishing.
Unfortunately, it would appear Rich failed to interview someone with an economics/finance background to know what kind of questions to ask and be able to differentiate between fixed, variable, and marginal costs.
The article is appropriately titled - "Math of Publishing Meets the E-Book". This branch of math must be similar to the Math of Music and the Math of Motion Pictures. They certainly are not related to the mathematics of economics and finance.
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