Sojourner01 said:
I find it perplexing that many students seem to spend vast sums on books when they're available from the library. In our case we have a departmental library with a fair-sized collection of undergraduate books and journals - so if they're not in the university library they're very likely to be in there.
Are you serious? Students aren't stupid. But...
1. Most lecturers specify that a given textbook is the "required" textbook for the course. That means it's not enough to go and get a book on quantum mechanics. It has to be the book specified.
2. This notion of a "required" textbook is reinforced by the fact that homework problems are often assigned from the textbook, making it necessary as more than just a reference.
3. The necessity of buying the newest edition of the book is usually guaranteed by the fact that the one thing the author definitely changes from edition to edition is the numbering of the problems (ostensibly because more have been added), so that anyone without the latest edition can't be sure which problems have been assigned in class.
4. Most designated course textbooks are not available for loan in the university library. Instead, they are "on reserve", meaning you can take them out for a maximum of two hours before having to return them.
5. Granted, #4 doesn't apply to older editions of the textbook, if they exist, but do you really think that the library would have enough copies of the textbook for, say, 100 students taking that course?
I think that 1-3 don't apply as much to students in 3rd/4th year, and a lot of lecturers like making up their own problem sets. But the point is that, even if 1-5 aren't true at your university, it seems a bit ludicrous to be "perplexed" as to why students, in general, have no choice but to buy most of their textbooks.