Obviously they can't change a physical book. Ebooks are a different story. Eventually (5 years) you will see ebooks include products mentioned in the body of t

Obviously they can't change a physical book. Ebooks are a different story. Eventually (5 years) you will see ebooks include products mentioned in the body of the text. These products will change from one reading to another depending on revenue and contract with the advertiser. Now, obviously, this depends on the platform used to present the ebook, but I am quite sure this will find its way into Kindle and iBooks.