Steve,
I only have one small argument with your Amazon manipulates prices. As it stands right now, an author can sell their ebook for anywhere from 99 cents to $200. Google and Kobo both allow free on their ebooks.
See this example:
http://www.amazon.com/Amazons-most-e...expensive+book
As to other products, I again believe the sellers set the price.
Now if we want to talk about manipulating prices I do believe that would be Walmart who at times does tell a manufacturer what they will pay for a product.