More and more money pros, from the ever-bull Jeremy Grantham to "Dr. Doom" Nouriel Roubini, are using the "B word." It's near impossible to predict when bubbles will pop or to what extent, but it's seemingly obvious when they are forming. Like witnessing a bad storm on the horizon, bubbles tend to display warning signs to encourage you to seek shelter. While it's been written in many publications that gut feelings mean we're in the midst of a stock bubble, I think the real warnings come from an unusual set of signs on the horizon.
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