Interest rates on four-week Treasury bills fell to zero today, as investors still sought the safety of government securities without any...

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WASHINGTON — Interest rates on four-week Treasury bills fell to zero today, as investors still sought the safety of government securities without any return on their investment.

The Treasury Department said it sold $30 billion in four-week bills at an interest rate of zero percent. That meant investors were willing to earn no return at all on their money as long as they could park it in the safety of Treasury securities.

The rate was down from an interest rate of 0.04 percent at last week’s government auction of four-week bills.

The zero interest rate for the four-week bills was an all-time low dating back to July 2001 when the government began issuing them.

Reflecting high demand, the amount in bids for the four-week bills was four times the amount sold at the auction.