Via blog.xplana.com:

Personally, I think this is a little conservative… though kids and professors on campuses would probably know more about how motivated professors are to switch to digital textbooks. What I do know is that no one likes spending $100 for a textbook and my professors were always empathetic to this.
Obvious investment plays are Apple and Google stock. Both are probably fairly priced now. None of these companies mentioned in the article are public, but there may be more like them. Another plan would be to find a publisher who …