Is John Bogle right that Vanguardís index and managed funds are comparable and by his example that investors should hold both? Each Vanguard managed fund produces the same return as the tracking basket of Vanguardís indexed funds plus a differential, a. If a, is positive the managed fund is...

Each month, GMO publishes on the web its predictions of the real rate of return for various asset styles over the next seven years. Its web library also retains its quarterly predictions, dating back to the end of the second quarter of 2000. I ask whether these predictions are accurate. My...