US T-BIll rates fell below zero today.
Bloomberg says: Treasury Bills Trade at Negative Rates as Haven Demand Surges
Treasuries rose, pushing rates on the three-month bill negative for the first time ... The Treasury sold $27 billion of three-month bills yesterday at a discount rate of 0.005 percent, the lowest since it starting auctioning the securities in 1929. The U.S. also sold $30 billion of four-week bills today at zero percent for the first time since it began selling the debt in 2001.
