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As has been pointed out, there can be a profit motive to a new edition coming out every couple years, and the profs do pay attention to that. There are a few that stick with older texts--but they do it knowing they may have to change texts if it goes OP (Out of Print.)
Some stuff is available used once it has gone OP, but that is a crap shoot and most profs want to be sure students do have texts. I have seen it done that profs put copies on reserve at the library so that the text is available for students who can't get copies of textbooks, so I'd suggest asking the profs about that.
I dunno what the college book industry is like now, but I can tell you that the used book industry is dominated by a handful of companies across the nation. It used to be that Follett College Stores was huge in the market along with a couple three others. Those companies set the prices that get paid for your buy back texts.
Many college bookstores buy back based on the order for the next semester. The top dollar is paid for stuff used there at that campus the next semester. They then pay what is called "wholesale" price for the book, meaning it is lower and it will entail cleaning up the book and shipping it to the wholesaler for distribution to other campuses.
If a book is going OP, most bookstores will not buy it back unless they have an order for that same text and edition already in hand for that next semester. Even then, they buy back a percentage of the number needed for the next semester so they won't get left holding any surplus copies that are, essentially, useless.
I'd suggest going on-line and looking thru the used book dealers to see if you can track down a copy of the OP book that may be sitting in a warehouse someplace.
One other note, many of the college bookstores are "lease operations" meaning a college bookstore company runs that store even if it is THE college bookstore. (To give an example, the college bookstore at Baylor was a Follett store even if it was the Baylor University Bookstore.) If you are unhappy with the bookstore, you can lobby the student government or the university administration to change companies when the lease is up. It does happen, and it is a big deal when it does.
I left that industry about ten years ago--and I have no idea who has what market share now--but I'm willing to bet that Follett College Stores and Barnes and Noble are still pretty big players in that game.
Pax.
Laura
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