A big day is coming for the faithful followers of the Oracle of Omaha. Warren Buffett’s annual letter is due out on Saturday, and he’s expected to take up the long-simmering debate about active versus passive investing.
Buffett has a somewhat complicated relationship with that debate. On the one hand, he is the most famous -- and arguably the most successful -- active manager on the planet. On the other, he has said that 90 percent of the money he leaves to his wife when he dies will be invested in Vanguard’s S&P 500 index fund -- the archetypal passive investment.
