Yields on short-term US Treasury debt have fallen to the lowest in history on mounting expectations of extra stimulus from the Federal Reserve.
Two-year rates fell to 0.52pc after a further batch of grim data hinted at a sharp slowdown in the second half of the year. Factory orders fell 1.2pc in June, while consumer spending fell flat.
The savings rate has risen to a one-year high of 6.4pc as Americans adapt to the new era of austerity and build a safety buffer against unemployment. "Households are repaying debt at a rapid clip," said Gabriel Stein from Lombard Street Research. "With an output gap at around 3pc, the US economy could move into outright deflation in 2011 for the first time since records began."