Anything rated BB and below is considered speculative grade or junk. [Junk Bonds, ETFs See Default Rates Drop to 2008 Low]The shift to income-oriented strategies over the past couple of years has pushed down yields and helped junk bonds rally.???When we think about high-yield in general, we think high-yield is a little bit of a bubble, but most of that bubble is really on the CCC credits and the B