Mortgage risk and the yield curve

We study the feedback from the risk of outstanding mortgage-backed securities (MBS) on the level and volatility of interest rates. We incorporate the supply shocks resulting from changes in MBS duration into a parsimonious equilibrium dynamic term structure model and derive three predictions that are strongly supported in the data: (i) MBS duration positively predicts nominal and real excess bond returns, especially for longer maturities; (ii) the predictive power of MBS duration is transitory in nature; and (iii) MBS convexity increases interest rate volatility, and this effect has a hump-shaped term structure.

JEL classification: G12, G21, E43

Keywords: Term structure of interest rates, MBS, supply factor

• Appendix to "Mortgage risk and the yield curve"

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