Just came up with this point while listening to video.
As learned from the class a document pointed by a trust worthy site will increase its page rank. Once the link is shown in higher order in the result, people start accessing it. Many will put this link in there web pages, which in turn increases the authoritativeness of the link, which further increases the page rank.
That means if two links with same information / potential usage gets there links listed by trusted site like NY times, the link that listed first remains in higher rank.
--bhaskar
