Providers of municipal bond pricing and evaluation services say they are managing to deliver accurate and transparent pricing of more than one million tax-exempt securities on a daily basis - even though the market is experiencing one of the most pronounced and prolonged periods of volatility in the last three decades.

Three of the leading pricing services - Standard & Poor's Securities Evaluations Inc., Interactive Data Pricing and Reference Data, and Moody's Evaluations Inc. - say it has been necessary to enhance and upgrade their existing pricing models, methodologies, and data collection procedures to keep up with the changing market. But they say the volatility has done little to deter them from delivering prices at the 4 p.m. close of the market every day.

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