Earlier quoted context omitted.
I completely agree with you: it's a scam. But we, the profs, don't have a lot of choice in the matter. Problem 1: we need to assign a text which is available to all students, and I can't guarantee availability of enough copies of the old editions. I'd love to use this book ( http://store.doverpublications.com/0486457710.html ) costing $20 for calc, but that brings up problem 2: I have to use the book the department a…
With problem 1, wouldn't the old edition still be cheaper than the new? Or would the publisher just stop publishing the older edition? Even with new editions I've come across situations where the bookstore was having an impossible time ordering enough to meet demand. And the second...I just guess I don't understand why new editions have to be adopted so quickly sometimes. I taught myself all sorts of subjects out of…
Several times in my experience the only difference between editions was that the publisher had changed the work problem (and maybe fixed some typos) for the sole purpose of making the students buy new books.