Basic CPM Question..

I have no experience working with any CPM networks but have recently been doing some research.
What I can’t differentiate is whether the CPM rates discussed with the major networks (Tribalfusion, interclick etc.) are for 1,000 impressions of a single banner, or for a page consisting of 2 or 3 banners?
I’m guessing it’s the latter but that would the surely make it objective to the positions and sizes of the banners. Alternatively I could be wrong and the CPM rates (i,e $0.5) could be per banner.

See original post by WallStreet