An article in Bloombergbusinessweek (Jan 30,2012) describes the conflict between publishers and Amazon.com ebook pricing plans of $ 9.99, the publisher controlled pricing model for sales on Apple’s iPad (termed agency pricing), and the resulting threat to without sales on Amazon.com by Macmillan which caused ebook prices to rise to $ 12.99.  The new threat is Amazon’s plans to start publishing books and competing directly with book publishers.  Is the earlier Macmillan, Apple alliance to drive up prices a collusion in the ebook industry ? Given Amazon’s publishing plans, how will it affect the use of Amazon as a selling channel for publishers ?