If there is so much demand for used books, why doesn’t the University Store buy back all of the textbooks students bring in?
There are many reasons why a book might not be bought back. Possibly the book is not being used anywhere next semester. The book may be part of a required bundle of items that cannot be sold separately. The copy may be in poor condition. The store and/or wholesaler may have reached the needed amount (the number of copies we buy back is based on anticipated enrollment for the next semester). We cannot afford to buy more copies than we expect to sell.