Apple's $90 billion run

On Oct. 4, the day before Steve Jobs passed away, Apple shares closed at $372.50 and its market cap stood at $347 billion. Four months later, the stock is up nearly $100 and it's market cap is $437 billion. To put that $90 billion gain in perspective, it's nine tenths the value analysts have placed on Facebook in advance of its initial public offering. Some believe that Facebook is being overvalued, but it's hard to argue that Apple is.