The tax-exempt market saw plenty of demand this week and muni yields fell to new record lows with each trading session. Market participants expect the rally to continue into next week as limited supply won't come anywhere near to matching demand.

"Munis feel like they can't be stopped," wrote Dan Toboja at Ziegler Capital Markets. "The market had another up day Thursday. Demand was extremely solid and new issues were again scooped up."

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