text: So you would hang on to a 20 year bond,issued on 2014...with a coupon of (lets say) 4% and currently trading at (I am Catstimating here) $1100 (ie 10% above par) ??
  If rates go to 5% that thing will be worth maybe $700...
  
  FYI Good info/Twitter feed on bonds;
  
  https://twitter.com/tracyalloway?lang=en