President Barack Obama knows who is the boss: the bond market.

"Ultimately, what matters is: What do the people who are buying Treasury bills think?" the president told reporters this week, when discussing measures he could take to end the threat of a historic default on the nation's debt.
Even with the U.S. budget deficit down by more than half since 2009 as a percentage of the economy, the Congressional Budget Office says the government this fiscal year will need to borrow an average of almost $11 billion each week. That's why Obama is so sensitive to what investors will tolerate.

"The market is the final arbiter of any policy, the ultimate barometer and enforcement mechanism," says Russ Certo, a managing director at Brean Capital LLC in New York. "The market holds risk-takers and policy makers accountable."

After weeks of confidently expecting a resolution of the standoff in Washington over the government shutdown and the debt ceiling, bond investors this week began to betray nervousness in their approach to short-term government borrowing.

The yield they demanded at the Oct. 8 auction of four-week Treasury securities almost tripled from a week earlier, Treasury Secretary Jack Lew highlighted in testimony before the Senate Finance Committee yesterday. The government was forced to pay 0.35 percent for four-week borrowings, up from 0.12 percent.

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