Long-term municipal bonds weakened on Wednesday due to renewed jitters about the scarcity of buyers for long-duration tax-exempt bonds.

The triple-A 30-year municipal weakened four basis points Wednesday to 4.83%, according to Municipal Market Data, after weakening a basis point Tuesday. The triple-A 10-year yield was unchanged at 3.34% Wednesday and has tightened 20 basis points since ­mid-January.

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