Just as Steve Jobs didn't invent the computer, Jack Bogle didn't invent the index fund. The first index fund was actually launched back in 1971, about five years before Bogle and Vanguard brought it to the masses. 

On this week's Trillions, we celebrate the 50th anniversary of the index fund with a conversation with John "Mac" McQuown, who worked with the head of Wells Fargo and a dozen academics (many of whom have Nobel prizes now) to develop the first, albeit short-lived index fund. We discuss the roots of the idea, the trials and tribulations of putting it into practice as well as his relationship with Bogle.