As has been said, this should be no surprise at all - especially if you've followed phenomenons like the Harry Potter books that got the same treatment.
Amazon underbid competitors on the short tail and make it up on the long tail.
Amazon also stand the benefit that nothing is technically "upsale", since it's all horizontally in the same basket, so they can't get accused of selling you extra stuff the way other vendors might.
Amazon underbid competitors on the short tail and make it up on the long tail.
Amazon also stand the benefit that nothing is technically "upsale", since it's all horizontally in the same basket, so they can't get accused of selling you extra stuff the way other vendors might.