Bogle on Mutual FundsBy: John Bogle John C. Bogle, founder of the Vanguard Group of Investment Companies, has built a $100 billion mutual fund company on principles of candor, fairness, and low cost. The most outspoken critic of the mutual fund industry, Bogle speaks to the serious mutual fund investor, both novice and seasoned, in this straightforward assessment of an industry Bogle himself helped revolutionize. Here he offers the essential principles of canny mutual