The retailers don't have to sign an settlement agreement, they were not uner investigation. Amazon might want to flex its muscles in negotiation but if the Publishers have a legal obligation to report X, Y, and Z to the feds you can bet that Amazon, as well as the other retailers, will have to play ball. So if there is language protecting pricing that says that no retailer can take a net loss on the sale of e-books then Amazon is going to have to deal with that.
As for price fluctuation, Amazon allows people to return an e-book in 7 days. If you buy an e-book and the price drops in that time frame, call Kindle Support and I have a funny feeling that they will refund you the difference.
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