Must be a 'professional investor' to do well picking stocks: Legendary investor Bruce Greenwald

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You have to be a professional investor ‘to do well’: Bruce Greenwald

Columbia Business School Professor Bruce Greenwald joins 'Influencers with Andy Serwer' to discuss the stock market and modern investing.

Berkshire Hathaway (BRK-B, BRK-A) CEO Warren Buffett and Vice Chairman Charlie Munger earlier this month set off fierce debate over the need for expertise in stock trading when they sharply criticized popular trading app Robinhood, with Buffett comparing it to a casino that takes advantage of people's "gambling instincts."

In response, Robinhood said, "People are tired of the Warren Buffetts and Charlie Mungers of the world acting like they are the only oracles of investing."