Internal linking can benefit a site a lot if done properly. So here is what i’ve learned:
Overall PageRank Power
The overall PageRank power is the PR that would be transferred to another site if all pages on your site linked to it. Say for example for you have website A which has a PR of 3 and you link to your disclaimer page (nobody else is going to link to that page besides you) on all pages on your site. The disclaimer page may get a PR 2 which eventually means that your overall PageRank power is 2. Now what this means is that if you are building a completely new site and it doesnt have a PR yet or is PR0, linking from your other site (overall PageRank 2) will give the new site a PR2.