The market for used books

There have always been markets for used books, and it's one of the markets that has been most changed by the internet. I recently received an email that seems to indicate another change, this one aimed at increasing the supply of used books. The email was from Amazon.com, and the subject line referred to a book I bought a few months ago: "Sell Back "36 Arguments for the Existence of God: A Work of Fiction"

The message went on to say

Dear Amazon.com Customer, Customers who purchased textbooks from Amazon.com may be interested in an easy way to get great prices for used titles through our Textbook Buyback Store.    Visit the Textbook Buyback Store