Negative yields could last through 2020, Vanguard exec says.

German 10-years join Swiss, Japanese debt in having negative yields.

German 10-years join Swiss, Japanese debt in having negative yields.

Flight to quality means flight away from government bonds in Eurozone, except Germany.

Flight to quality means flight away from government bonds in Eurozone, except Germany.

European bond market rattled by concerns that Greece will roll back budget controls if it exits IMF bailout early.

European bond market rattled by concerns that Greece will roll back budget controls if it exits IMF bailout early.

Bloomberg survey shows analysts expect euro to fall to median US$1.32 by midyear and US$1.28 by year-end.