John Bogle is at it again.

This time, he took another swing at ETF investing in a Bloomberg interview with Tom Keene. “Only an idiot would trade the S&P 500 all day long,” said Bogle, suggesting that this is the predominant behavior of ETF investors. Is it?

There’s no questioning Bogle’s monumental influence in the field of finance and investing over the past 40 years. But is he infallible?

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