I'll try to explain it simple.
Imagine situation:
Your page PR=2 <- ...........{A}....link.....{B}............... -> Their page PR=4.
{A} link from their page to yours -> can give you hopefully PR3, as their PR higher.
{B} link from your page to theirs -> don't effect their PR, as yours is lower.
Only higher rank having web pages can affect lower PR pages.
Regards,
Alex
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