First off, I'm not quite sure about what the issue is. I seem to remember that Amazon said they wanted a hard ceiling, no books selling for >$10. The article claims that what the publisher wants is the ability o change book prices based on demand. Correct me if I'm wrong, but I thought that all Amazon was saying was "You know the $10-15 range you wanted to price eBooks at? You can't do that."
Second is more of an economics question. The article mentions Price Fixing in relation to gas prices, and how fixing the prices caused gas prices to go up due to hoarding. How does that work in a Monopoly, where the publisher not only controls the only source of the books, but can also make more of a single work at a negligible cost? (Yes, I understand that there is an outlay at the beginning, but after that the cost of producing additional copies of the eBook is nearly non-existent. You don't have to keep a stock of the eBooks that you can potentially lose money on, you don't have to pay in advance to have each copy produced. This changes things, but I don't know how.)