After doing a lot of thinking about it, I don't know I agree with Stross that DRM hurts publishers, rather than help retailers like Amazon. I don't think it helps publishers any, since those who are break DRM are going to. We all know how ineffective it is for those with the knowhow.
There is an interesting article linked in the comments that claim that the biggest beneficiary of the Agency model was Barnes & Noble, who didn't have to worry about going on a price war with e-books with Amazon, since the publishers set the price.
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