Vanguard's Jack Bogle on Indexing, Negative Rates

Sept. 9 -- Mutual fund sage and founder of the Vanguard Group Jack Bogle hits back at critics of indexing, the practice of organizing one's portfolio to match an index. Bogle also discusses negative interest rates, the use of ETFs, and what he views as the biggest market risks. He speaks with Bloomberg's Matt Miller and Scarlet Fu on "Bloomberg Markets."
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