I am struggling to comprehend the difference in impact between spread duration & IR for a fixed rate bond when yields move.
I know that both measures would be the same for a fixed rate bond but how exactly do they differ when yields fall? So for example, if the bond had a spread & IR duration of 2 years, then if yields fell by 1% then my bond price would increase by 2%? If so, does that mean if I am concerned about falling yields I could put on a future position to protect against yields falling, but would that also protect my credit duration exposure?
Thanks