Banks may issue less debt if rates stay as high as last week's credit- market selloff sent them, some banking experts say.

James A. Bianco, director of research at Arbor Trading Group Inc. in Barrington, Ill., said last Friday was among the worst days ever for the government's benchmark 30-year Treasury bond, which fell 2.75 percentage points in price. The long bond's worst single-day performance was in March, when it fell 3.34 points.

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