This story is available exclusively to Business Insider subscribers. The 36-minute video was sent to Business Insider ahead of its public debut. Related stories"The efficient market hypothesis is that the market is always right," Marks said in a recent interview with Business Insider. Studying stocks' correlation with each other adds another dimension to investing, Marks said. Advertisement"3D chess is much harder than 2D chess, and so correlation is much harder than just risk and return," Marks said.

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Persons: —, Howard Marks, Marks, that's, you'll, heeding Marks, it's Organizations: Service, Business, Oaktree Capital Management, Investors