'Who am I to be bold?' Warren Buffett's lack of stock purchases worries billionaire investor Leon Cooperman

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· *Warren Buffett's lack of stock purchases during the market meltdown is a red flag for Leon Cooperman, the hedge-fund billionaire said in an email this week, according to Benzinga.*
· *"Who am I to be bold?" the Omega Advisors chief asked, when the "greatest investor in my generation" isn't buying.*
· *Buffett's...