Its independent of its positon, but the google will priority to High PR sites, while people are searching for something in search engine with keywords..
I think position and high PR is independent.
High PR gives high quality post or high quality content page. Google has algorithm that use for give you points between 1 to 10 to your page.
But in SERP(position) you will see different view. It is based on people most looking for particular keyword for that page or website. It depends on targeted traffic to site or page for particular keyword.
In my point of view search engine gives better ranking of good pagerank website.
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