Robert Shiller, the Yale professor and Nobel-prize winning economist is "definitely concerned" about the outlook for stocks, noting valuations have only been this high three other times: 1929, 2000 and 2007

Robert Shiller, the Yale professor and Nobel-prize winning economist is "definitely concerned" about the outlook for stocks, noting valuations have only been this high three other times: 1929, 2000 and 2007

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