Compared to an index of 100 U.S. exchange-traded stocks, an index of 100 U.S. government and corporate bonds will most likely'.

Bond indexes are more difficult to build and maintain than stock indexes for several reasons. Bonds in an index have to be replaced as they mature, so turnover is likely to be greater in a bond index than in a stock index. Many bonds lack the continuous trade data that exists for exchange-traded equities.