hi,
PR doesn't effect your rankings on serps. It is just number that shows popularity of your domain.
Actually it just shows the popularity of one particular page as each each page has its own PR. Home pages for websites tend to have the highest PR in a website simply because they tend to have the most links pointing to them. But this sin't always the case. There are a lot of websites that have excellent subpages that receive a lot more links to them then the website home page. As a result they have a much higher PR then the home page.
Johalber
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