If you had told a bond trader three years ago that the euro zone bond market would be performing as it is now, chances are you would have been laughed out of the room.

Countries once seen as deeply troubled Spain and Ireland, now have lower yields on their 10-year bonds than the U.S, while the yield on Italian 10-year bonds is just a fraction above that of the U.S. 10-year - even though the U.S.'s economic recovery seems stronger on many metrics.