I don't understand where Ken Auletta gets his figure of Amazon charging $9.99 for all Kindle editions. --or was that only until they caved to Macmillan? Maybe

I don't understand where Ken Auletta gets his figure of Amazon charging $9.99 for all Kindle editions. --or was that only until they caved to Macmillan? Maybe he took the example of Mossberg challenging Jobs in January on Apple's $14.99 for "True Compass" when Amazon sold it for $9.99, but at the moment Amazon's Kindle price for it is $16.99 But in my memory it's always seemed that Kindle editions (and I'm at Amazon.com daily) were priced a dollar or two less than the Amazon price for a paperback edition -whatever that might amount to [allow for my short memory].