Slide in repo rates a result of U.S. Treasury effort to reduce cash balance by mid-March.

Slide in repo rates a result of U.S. Treasury effort to reduce cash balance by mid-March.

Amid sluggish consumer borrowing, bank holdings of Treasuries have surpassed $2 trillion.

Liquidity problem in Treasuries market may be unintended consequence of financial regulations, and will likely worsen when interest rates rise.

Liquidity problem in Treasuries market may be unintended consequence of financial regulations, and will likely worsen when interest rates rise.

Traders expect demand for Treasuries to dry up as investors' confidence in U.S. economy grows.

Waning interest in overseas stocks could bolster U.S. currency's gains.

Waning interest in overseas stocks could bolster U.S. currency's gains.