A poorly written "book" that you are forced by
naive professors to purchase at outrageous prices. To curb
the used market, the pages are renumbered, the cover changed, and
the book republished as a "new edition" every few years.
Person #1: Dude, i just sold back all my college textbooks and got $80 dollars!
Sweet!
Person #2: Do you remember what you paid for them?
Person #1: Yeah, $600. Why?
Person #2: Never mind...