Yen Carry Trade Snaps After 4 Week Bill Prices Deep Below Fed Funds

Moments ago the US Treasury priced its 4 Week Bill auction, which was unique in that at just $35 billion, was not only $10 billion lower than a month ago, but was the lowest since October 15.
This may or may not explain why after last week's curious auction yield of 0.20%, or 5 bps below the effective Fed Funds floor, today's auction showed an even more dramatic scramble for short term liquidity, when the government sold 4 Week Bills at a rate of 0.185%, or 6.5 bps below the rate charged by the Fed!