What if everything you bought from Amazon was automatically available for resale used after a certain period of time? You're thinking of buying the $79 textbook

What if everything you bought from Amazon was automatically available for resale used after a certain period of time? You're thinking of buying the $79 textbook, but Bob who lives across the street will sell it to you for just $39 (Amazon gets $10 for facilitating the transaction, but will take the risk) and Amazon knows he's home right now. Or you borrow it from him for a week for $19, he'll also lend you his blender for another $19.