Textbook publishers have a habit of issuing new or "customized" editions every year or so. This is why college bookstores buy back used textbooks for less than a quarter of their purchase price or refuse to buy them at all. Textbook sales personnel constantly show up in professors' offices to push their line of new and improved textbooks. I think this practice of incessant revision is intended as a means of reducing the market for used textbooks and fending off rental library programs. If they could get away with it, publishers would issue a new edition of Shakespeare's plays every year.
Used textbooks were unpopular with both publishers and authors: they do not earn royalties from sales of used textbooks. If they could do so, I suspect that they would want the same condition as is found in sales of software: you are not permitted to sell your software to someone else because you did not purchase the software. You purchased only a personal or organizational license to use the software.
When I use printed textbooks, I try to make certain that I am using an edition that is still widely available as a used book. The version differences are often trivial. However, the campus bookstore often cannot find 80 or 100 copies of an out-of-date edition. They do not keep old editions in inventory; they must order them. The old editions seem to vanish, I suspect into pulping machines.
For many years there was a variety of scam artist who also showed up in professors' offices. These were people offering to "buy books," by which they meant the examination copies that had been sent to professors without request and without charge. I must get at least 25 unwanted books every year. The professors who sold what they had been sent were cheating, but they made a few hundred unreported dollars each year. Some publishers stamp their "examination copies" as that, but it apparently did not diminish the value to these scam artists.
We have adopted and posted a policy that requires anyone wishing to buy books, equipment, or supplies to check with the campus police, so our experience may now be different. However, the current low number of "visitors" may mean that the number of these scam artists has sharply declined simply because textbooks lose their value so swiftly.
It would be great if rental libraries could succeed, but I think the more important change will be to reduce the initial purchase price. The only way that I see to do that is to move to ebooks. They eliminate most of the printing, shipping, and inventory costs. In addition, the college book store no longer needs all that shelf space. The advent of color tablets with high resolution has made ebooks practical in almost every field.
The fact that these ebooks can contain hyperlinks to materials on the Web makes them more functional as teaching tools than bound books ever were. Some ebooks now link to videos, which are far more effective in conveying a point than are pictures. Viewing photographs of mitosis is less effective than viewing
mitosis in action. Photographs of the marches over the Edmund Pettus Bridge are far less effective than
http://www.youtube.com/watch?v=s00-OoZAWno. An ebook can also link to computer programs that do calculations or simulations that help students understand such things as "sampling distributions."
Rice Virtual Laboratory. Even in the area of law, the
Oyez project offers something that no book can offer: access to both transcripts and oral arguments. Science ebooks can be kept up to date with the latest findings; my intro biology textbook barely made mention of the double helix. One of the reasons for that was that revisions are much cheaper than are complete rewrites. Science cannot be frozen on a publication date.
I think the printed textbook will be perceived as a transition between the days of the "say-everything-twice" lecturer and the world of active participation by students in searching out information. Then they might actually read the material!