U.S. Treasury Secretary Jacob J. Lew

U.S. Treasury Secretary Jacob J. Lew

Michael Nagle/Bloomberg

Benchmark 10-year yields dropped to the lowest level in six weeks after U.S. Treasury Secretary Jacob J. Lew said investor confidence that a deal can be struck to raise the debt limit is “a bit greater than it should be” and the government probably will have less than $50 billion in cash by mid-October.