Saudi Prince offended by rich list: says it underestimates him

Prince Alwaleed bin Talal of Saudi Arabia was named by Forbes as the word's 26th richest billionaire, with a fortune of $20 billion. He responded with outrage, claiming that his vast wealth had been underestimated by $9.6 billion, and vowing to sever all ties with the publication.

Forbes has defended its valuation. So what's going on?
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