The story of the Vanguard 500 Index Fund's founding in 1976, and the inspiration from Nobel Laureate economist Paul Samuelson, is told by founder John Bogle. On August 31, 1976, the first index mutual fund, First Index Investment Trust was born. It was launched by Bogle at Vanguard. The idea he put forth was that passive index management could outperform active management with its fees, load, commission and other costs. The IPO target was $150 million, but the underwiritng resulted only in $11.3 million. The underwriters suggested cancelling the deal, saying that this was not enough to own all 500 stocks in the S&P 500 Index. Bogle's response was just the opposite- he now had the world's first index mutual fund. Here Bogle talks about the early inspiration. His senior thesis at Priceton University in 1951, in which Bogle broached the idea that mutual funds could not say they were superior to market averages, received support from Samuelson. This was followed by the article 23 years later by Samuelson in "Challenge to Judgement," an article in the Journal of Portfolio Management in summer 1974, that stated: "that some large foundation set up an in-house portfolio that tracks the S&P 500 Index." Bogle took up the challenge and offered well diversified funds at minimal costs, with a focus on the long term investment. Writing in Newsweek in August 1976, Samuelson said that his prayer had been answered. Bogle describes how his inital encounter working with Samuelson's "Economics: An Introductory Analysis," was difficult. He barely made a C-. In 1993 Samuelson offered to write the foreword on Bogle's first book- "Bogle on Mutual Funds." The relationship lasted 61 years!...