Pop quiz! If I asked you, “Who invented the index fund?” what would your answer be? I'll bet most of you don't know and don't care. But those who do care would probably answer, “John Bogle, founder of The Vanguard Group.” And that's what I would have answered too until a few weeks ago. But, it turns out, this answer is false. Yes, Bogle founded the first publicly-available index fund.