A stable world.
Just like the stock mkt., the bond mkt. is diversified so if you can't make money on bonds from one country, you make it from another.
Unfortunately, with the Fed. constantly keeping our rates from 0 -.25%, uncertainty about what congress is going to do, the bond investors don't want to take any chances investing in the wrong place. Remember the bond holders that didn't get their money from GM when the Gov. took over?
Over Europe Greece doesn't have money, Europe is now saying Italy may not get the money that was promised, and Spain is now complaining they need money. Now China is warning they may not invest in Euro bonds anymore.
Analysts are predicting China will be next because exports to both Europe and U.S. are falling.