A lot of the problems today result from the Economic crisis were still in and the Fed prematurely raising rates. The problem is the World economy hasn't recovered to its pre crisis level, yet debt increased. This debt has to be serviced ( pay interest ) and in order to do this without designating more from budget GDP has to increase. GDP hasn't increased enough so countries are lowering rates. 4 EU countries entire debt offerings are all negative rates. Which means one has to pay the issuer to hold them. Today circa 1/3rd of government debt offering is negative rates.
Now one has to wonder why someone would purchase bonds with negative rates? Well as rates go down the face value of the bond goes up. So buyers believe future rates will be lower which will push the face value higher. In the mean time governments can basically borrow money for free. Which means they don't have to be concerned with increasing GDP because they don't have to pay interest.
One of the major arguments against QE ( quantitative easing ) was governments would become comfortable with increasing debt beyond budget due to the low rates. Now we see this has led to governments being PAID to borrow money with negative rates.
Not a bad deal for governments, huh?