VTEB tracks the Standard & Poor’s National AMT-Free Municipal Bond Index, which measures the performance of the investment-grade segment of the U.S. municipal bond market. MUB seeks to track the investment results of the S&P National AMT-Free Municipal Bond IndexTM, which also measures the performance of the investment-grade segment of the U.S. municipal bond market.
The sampling approach means that both funds hold a subset of bonds within the index in order to replicate the yield, duration, and credit quality of the debt. This method allows the funds to avoid trading expensive bonds that could harm performance and in addition, minimize tracking errors.
With respect to an average net expense ratio of 0.32 percent in their category, both funds deliver very low costs–0.08 percent for VTEB and 0.07 percent for MUB.
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