According to Eric Balchunas (@EricBalchunas), Warren Buffett personally responded to a request for quotes regarding index investing for a Bogle-focused book, highlighting Buffett’s ongoing endorsement of low-cost index funds as a superior long-term strategy (source: Eric Balchunas on Twitter, May 4, 2025). For traders, this reinforces the importance of considering index ETFs and related products, especially as Buffett’s viewpoint continues to influence institutional and retail flows toward passive investment vehicles.