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John Bogle graduated from Princeton University in 1951, where his senior thesis was titled The Economic Role of the Investment Company.[3] Bogle wrote that his inspiration for starting an index fund came from three sources, all of which confirmed his 1951 research: Paul Samuelson's 1974 paper, "Challenge to Judgment"; Charles Ellis' 1975 study, "The Loser's Game"; and Al Ehrbar's 1975 Fortune magazine article on indexing. Bogle founded The Vanguard Group in 1974; as of 2009 it was the largest mutual fund company in the United States.[citation needed]