How do you invest in the Lehman Brothers Aggregate Index?

You could consider the iShares Lehman Aggregate Bond Fund (AGG), an exchange traded fund (ETF) managed by Barclays that "seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the total United States investment grade bond market as defined by the Lehman Brothers U.S. Aggregate Index." At 0.20%, the fund expenses are low compared to a traditional mutual fund. You can find more information on ETFs using tools such as the Fidelity Fund Screener (see Related Links).