In the supermarket of investment products, municipal exchange-traded funds are a relatively new brand label, but have been steadily gaining attention and experiencing noticeable growth of assets and trading volume since their debut in fall 2007 at the start of the credit crisis.

Analysts who cover the fledgling product say they expect to see further growth from the low-cost alternative to traditional mutual funds - especially as new investors seeking bargains continue to use the muni ETFs to gain entry into the tax-exempt marketplace.

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