The stock market is riskier and more volatile than it was in past decades. Here's why.

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NYSE traders

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There are 2 signs that stock market euphoria is mirroring past bubbles and could end badly for investors

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Market crash 2008
The stock market is mimicking 2 other financial bubbles of the past before bursting, according to one investment advisor.

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Jeremy Grantham and Bill Gross have warned stocks are overvalued. Wharton professor Jeremy Siegel disagrees: "They are underpriced"

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Wharton professor Jeremy Siegel
Wharton professor Jeremy Siegel is a long-time market commentator.

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