In his recently published book – The Bogle Effect – Eric Balchunas credits Jack Bogle, the father of index investing and founder of the Vanguard Group, with saving investors over one trillion dollars (and counting), thanks to the direct and indirect effects of lower investment costs. Although the low cost structures of index funds take much of the credit, it is the unique mutual ownership structure of Vanguard that serves as the catalyst for investors receiving all the benefits of lower fees.