Indexing has limitations. Some markets or market segments are easier to index than others. The degree of difficulty is largely a factor of the breadth, depth, standardization, and liquidity of the pool of assets in question. Nonstandard assets that are difficult to trade, like municipal bonds, can be difficult to index. Indeed, running an index-tracking municipal bond fund is a tricky proposition. The managers of an indexed municipal bond portfolio have to strike a balance between tracking their index and the costs involved in doing so. Based on the performance records of many of the municipal bond index funds available to investors, these funds’ managers appear to be capable of managing
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