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It sounds as if you're thinking of books as commodities, like bushels of wheat, where you might as well buy this one as that one. In some cases you'd be right, and you might as well read this genre book as that genre book. Prices will be most competitive in this area.
In other cases the author works to build his/her "brand" so that the book is not easily replaceable by any other. These books can maintain higher price points.
I don't believe there is any single model that applies equally to every book.
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