Are We Headed for a Tech Stock Bubble?

Dow, S&P 500 reach record high, but tech investors are not partying like bubble of 1999.

Specialist Anthony Rinaldi is reflected in one of his screens at his post on the floor of the New York Stock Exchange, Monday, Nov. 18, 2013.
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"In the late 1990s it is fair to say that across the board, hardware software, equipment, services, everything seemed to kind of have inflated demand and inflated valuations," remembers Kessler, who started analyzing tech stocks in 1998. "Today it seems limited to a handful of areas like social media and cloud computing."

Colas offers this familiar advice to investors: Avoid betting too heavily on just one stock, or buying "because they heard a hot stock tip at a cocktail party."

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