Yields on $7.8 trillion of government bonds have been driven below zero by worries over global growth, meaning money managers looking for income are pouring into debt with maturities of as long as 100 years. Central banks' policy is exacerbating matters, as the unprecedented debt purchases to spur their economies have soaked up supply and left would-be buyers with few options.
While demand has shown few signs of abating, investors are setting themselves up for damaging losses if average yields rise even a little from their rock-bottom levels. Based on a metric called duration, a half-percentage point increase would result in a loss of about $1.6 trillion in the global bond market, according to calculations based on data compiled by Bank of America Corp. This year alone, the danger of owning debt has surged by the most since 2010. — Bloomberg