ECB Buys Negative Yield Covered Bonds; Trade Guaranteed to Blow Up

``"The ECB has caused this situation by being a big buyer and has exacerbated the already negative net supply of covered bonds," said Joost Beaumont, a fixed-income strategist at ABN Amro in Amsterdam. "If the ECB buys more, yields will go still lower and that's going to affect the ECB itself."''