Last week Apple became only the sixth company in US history to be worth $500bn. It is so vast that its shares, which have gained 30% since the start of this year, now make up 4% of the entire S&P 500 stock index.
Paul Kedrosky, a Silicon Valley investor and editor of the technology blog Infectious Greed explains to the Today programme's Simon Jack if the tremendous growth in Apple's share price is sustainable.
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