From the Washington Post:
... Buffett says that for "the nonprofessional" (that's the rest of us), there's no need to be picking winners in the stock market, or hiring someone else to do it either. And you should definitely ignore people on TV who try to predict broader market conditions.
A low-cost S&P 500 index fund, which captures a wide enough cross section of businesses, should be plenty. And he reveals that he's following his own advice in his will (emphasis added):My money, I should add, is where my mouth is: What I advise here is essentially identical to certain instructions I've laid out in my will. One bequest provides that cash will be delivered to a trustee for my wife's benefit. (I have to use cash for individual bequests, because all of my Berkshire Hathaway shares will be fully distributed to certain philanthropic organizations over the 10 years following the closing of my estate.) My advice to the trustee could not be more simple: Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund. (I suggest Vanguard's.) I believe the trust's long-term results from this policy will be superior to those attained by most investors -- whether pension funds, institutions, or individuals -- who employ high-fee managers.So there you have it. You don't need much more than a Vanguard S&P 500 index fund. ...