Further to yesterday’s reporting of AAP monthly sales data for April, we have updated versions of our standing charts of ebook sales patterns. One clear trend is that the days of doubling or more are over; as the ebook sales base rises, the year-over-year growth is moderating. In fact, over the past few months, that growth rate has dropped dramatically. As this tabulation shows, September 2011 was the last time AAP-monitored ebook sales doubled. The growth rate diminished in October, just in time for the biggest quarter of book sales, and held through the post-Christmas ebook spike in January. But […]