The giant question mark of whether bankers will be able to find buyers for municipal bonds if and when they come in heartier supply continues to keep dealers sidelined, demand sickly, and yields drifting up.

Yields on triple-A municipal bonds Friday leaped by as much as five basis points for certain maturities, according to Municipal Market Data, with the benchmark 10-year yield up two basis points. The 10-year yield, at 3.21%, has spiked 31 basis points since March 16.

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