Investing is all about common sense. Owning a diversified portfolio of stocks and holding it for the long term is a winner's game. Trying to beat the stock market is theoretically a zero-sum game (for every winner, there must be a loser), but after the substantial costs of investing are deducted, it becomes a loser's game. Common sense tells us--and history confirms--that the simplest and most efficient investment strategy is to buy and hold all of the nation's publicly held businesses at very low cost. The classic index fund that owns this market portfolio is the only investment that guarantees you with your fair share of stock market returns. To learn how to make index investing work for you, there's no better mentor than legendary mutual fund industry veteran John C. Bogle. Over the course of his long career, Bogle--founder of the Vanguard Group and creator of the world's first index mutual fund--has relied primarily on index investing to help Vanguard's cl...