Very interesting article and comments; particularly the suggestiong that the higher priced (and higher ranked) seller may not actually have the book and, if ordered, would order it from the lower seller, mark it up, and then sell it to the buyer.
Although some of the comments suggest that this kind of behavior is wasteful and adds no value, they are not correct - people are more than willing to pay somewhat more for an item to purchase it from a more reliable seller. I will almost always choose to buy something from Amazon, for example, even if it is slightly more expensive, because I know that Amazon will deliver the item promptly, that they will resolve any difficulties I might have with the delivery, and because I can minimize the number of people who have my personal information.
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