An anonymous reader writes: Amazon has waged a constant battle with publishers over the price of ebooks. They've now publicly laid out their argument and the business math behind it. "We've quantified the price elasticity of e-books from repeated measurements across many titles. For every copy an e-book would sell at $14.99, it would sell 1.74 copies if priced at $9.99. So, for example, if customers would buy 100,000 copies of a particular e-book at $14.99, then customers would buy 174,000 copies of that same e-book at $9.99. Total revenue at $14.99 would be $1,499,000. Total revenue at $9.99 is $1,738,000." They argue that capping most ebooks at $9.99 would be better for everyone, with the money split out 35% to the author, 35% to the publisher, and 30% to Amazon. Author John Scalzi says Amazon's reasoning and assumptions are a bit suspect. He disagrees that "books are interchangable units of entertainment, each equally as salable as the next, and that pricing is the only thing consumers react to." Scalzi also points out that Amazon asserts itself as the only revenue stream for authors, which is not remotely true. "Amazon’s assumptions don’t include, for example, that publishers and authors might have a legitimate reason for not wanting the gulf between eBook and physical hardcover pricing to be so large that brick and mortar retailers suffer, narrowing the number of venues into which books can sell. Killing off Amazon’s competitors is good for Amazon; there’s rather less of an argument that it’s good for anyone else."