The idea is good, but there are fatal loopholes. Most of the books that can be deposited with you are not used. For example, the rate of one day 1 cent, if that person wants to support them for life, you will lose a lot, as long as you buy them at a low price. It is especially good to buy books at one time in college. You can rent some elective textbooks or some books for the next few classes. Some people want to keep it and can change hands.