are the new editions. The author makes a few changes, the publisher prints a new edition and gives your professor an "incentive" to prescribe the new edition for the course, and bingo, you can no longer use last year's textbook for that course (or at least they make it difficult for you). The following year there is a new edition of the book you just bought and your used text book is pretty well worthless.
Yeah, I've been there.
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