I have two versions of my website- www and non www. The non www ranks higher than www. Will redirecting the high rank(i.e non www) to low rank (i.e. www) page reduce the overall page rank or the rank will be the average of both pages?
Technically, if you redirect to the www version, all equity will be passed from the non www version. However, if you are using tools to view 'page rank' or 'page authority', this may not necessarily update due to signals that they look at (e.g. links to that exact URL as opposed to links to redirected URLs).