Kevin Kelly says:
Warren Buffett recently bet an ambitious hedge fund operator $1 million that they won't beat the returns of S&P 500 after their extremely hefty fees are accounted for. Buffett claims investors will do as well with a no-load index fund over the ten years of the bet. He has long been critical of the performance claims of hedge funds, and his bet is intended to put his money where his mouth is.
Buffett's million dollar bet was made on Long Bets, the accountability mechanism founded in 2002 by Stewart Brand and myself, and operated by Long Now Foundation. The intention of Long Bets is to encourage responsibility in prediction-making (by keeping a public roster of predictions), to encourage long-term thinking (by offering a opportunity to shape a long-term bet), and to sharpen the logic of forecasting (by recording the logic of predictions and bets.)
In order to make a Long Bet, bettors need to lay out their reasoning. It's worth reading the two sides' very short arguments about investing because the two extremes of investment advice are contrasted in them. Buffett, as usual, is stunningly clear in his argument, which ends:
A number of smart people are involved in running hedge funds. But to a great extent their efforts are self-neutralizing, and their IQ will not overcome the costs they impose on investors. Investors, on average and over time, will do better with a low-cost index fund than with a group of funds of funds.