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Originally Posted by Shaggy
That doesn't explain the common practice of tweaking the textbook just enough so that the previous edition in the used bookstore is useless. That sounds like a deliberate attempt to make money at the expense of their students.
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I had a Calculus professor who was outraged by that. The new edition was the same material, they just rearranged the chapters and the exercise questions at the end of the chapters. He told us on the first day it was ok to buy the previous edition used and he would give the exercise question numbers for both the old and the new when he assigned them to us.