When publishers sell books to bookstores they allow the bookstore to return the unsold portion of books, which are often then destroyed. So a bookstore can order 100 books, sell 50, and then return 50, which are destroyed. This means that if you bought one of these books then in reality you paid for both the book you read and the one that was destroyed. This practice shouldn't apply to ebooks, so ebooks should be cheaper.
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