In the previous model it is true that prices for eBooks on Kindle were set by one entity: Amazon. However, that did not mean that the prices of eBooks were fixed by Amazon. There are these things known as "other eBookstores" (e.g. Barnes & Noble Nook, Kobo and Sony Reader) that set their own prices for eBooks after paying the wholesale price for the eBook, just like Amazon.
There is clearly less pricing diversity after the agency model than before, where there is a single entity setting eBook prices on a book-by-book basis: the publisher.
There is clearly less pricing diversity after the agency model than before, where there is a single entity setting eBook prices on a book-by-book basis: the publisher.