Can anyone explain to me why is it that some company NAV is lower than its share price some is higher?

Also is it a good or bad thing that its NAV is actually much higher that its share price?

Thks

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Added on September 23, 2009, 11:47 pmCome on...help please...really want to know...will be grateful for whoever that can answer my question...

Thks in advance

This post has been edited by nickiat: Sep 23 2009, 11:47 PM