When interest rates start going up again permanently, when the bull market does come to an end in government bonds, interest rates are going to go very, very high.
In 1981, short-term in America were over 20 percent. Long-term bonds were yielding over 15 percent.
When interest rates go higher the junk bonds are going to get destroyed both by interest rates and by credit defaults. (SPDR Barclays Capital High Yield Bond ETF (JNK))