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Warren Buffett disciple Guy Spier reveals his biggest mistakes — and how he makes investing decisions now

CNBC PRO Talks: Bitcoin, gold or China? Guy Spier weighs in on where investors can put their money
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CNBC PRO Talks: Value investor Guy Spier shares his take on China, gold and bitcoin

Guy Spier's investment style may have been influenced by one of the most successful stock pickers of all time, but he admits that, like all investors, he's made some mistakes along the way.