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Anyway, the part that struck me which I wasn't aware of before was that a given URL, with PR of X, will distribute this PR evenly among ALL on-page links... whether they are external or internal. I wanted to ask and confirm with the experts on here, because I guess I had always assumed that for a given URL, there was a pool of Internally-allocatable PR and a pool of Externally-allocatable PR, so whether I had 0, 1, 2, or 3 links to other sites for example, this would not affect the PR being passed back via a breadcrumb let's say to the home page.
But this paper seems to be saying that if I have B, on my site, linking to A, my home page, and I add a link from B -> C (an external site), B is now passing less PR back to A (half in this simple example)
Is this right? Is per-URL PR a total pool from which internal and external links are split evenly?