March 21 (Bloomberg) -- Warren Buffett made a friendly bet four years ago that funds that invest in hedge funds for their clients couldn’t beat the stock market over a decade. So far he’s winning. The wager that began on Jan. 1, 2008, pits Buffett against Protege Partners LLC, which built an index of five funds that invest in hedge funds to compete against a Vanguard mutual fund that tracks the Standard & Poor’s 500 Index. The winner’s charity of choice gets $1 million when the bet ends on Dec. 31, 2017. Betty Liu reports on Bloomberg Television's "In the Loop."