It is important to note that upward sloping credit curves imply a widening of spreads, flat credit curves imply stable spreads and inverse credit curves imply tightening spreads. Again, as with government bonds implied spreads differ from expected future spreads. Longer term corporate bonds should not only contain a premium that compensates investors for accepting higher price volatility, but also for taking on additional credit risk.
A second observation with respect to forward credit curves is related to the slope: The steeper a credit curve is, the larger is the implied spread widening. If the spread widens less or more than indicated by forward spreads over the holding period, certain bonds will perform better than others. Portfolio managers who have a strong view on the spread changes they expect for an issuer’s bonds may benefit from this fact. If, for example, they expect the bonds of an issuer with an upward sloping credit curve, as France Telecom, to widen less than implied by forward spreads, they would prefer to own longer term bonds, because the additional carry should overcompensate the capital loss due to the expected spread widening.
