ON MARCH 22ND Germany's worst manufacturing survey in seven years sent investors rushing to buy bonds. For the first time in three years yields on German ten-year government debt fell below zero, meaning that investors are willing to pay to hold it. And later that day in America the yield on ten-year Treasury bonds fell beneath that on the three-month variety. The last time that happened was 2007, one of the "inversions" in bond-market yields that preceded each of the past seven American recessions.
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