Silicon Valley's Moneymen Can't Beat the Market

Marissa Mayer, President and CEO of Yahoo!. and David Karp, founder and CEO of Tumblr appear on Good Morning America in May Photograph by Donna Svennevik/ABC via Getty Images

Being a venture capitalist would seem like a great job: Ideally you spend your days meeting passionate startup founders, funding their breakthrough ideas, and then raking in tenfold or hundredfold returns as the companies go public or get acquired by Silicon Valley giants.

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