There are terabytes of YouTube videos dedicated to explaining how the stock market works to people who never took an econ class in college. But when Stock Investing for Dummies fails, Openfolio creates a network of investors to show its users how people are investing. It crowdsources information and helps keep potential investors from buying high and selling low. For the clueless, it’s like ten episodes of Mad Money; for the ruthless, it’s a way of gauging when to sell short.

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