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The nominal duration of TIPS bonds

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  • Francis E. Laatsch
  • Daniel P. Klein

Abstract

This paper studies the price responsiveness (effective duration) of U.S. government issued inflation‐indexed bonds, known by the acronym TIPS (Treasury Inflation‐Protected Securities), to changes in nominal interest rates, real interest rates, and expected inflation. Using the TIPS pricing formula derived by Laatsch and Klein [Q. Rev. Econ. Finance 43 (2002) 405], we first confirm that TIPS bonds have zero sensitivity to changes solely in expected inflation. By changes solely in expected inflation, we mean that the real rate remains unchanged and the nominal rate changes in accordance with the established Fisher [Publ. Am. Econ. Assoc. 11 (1896)] effect. We show that the first derivative of the TIPS price is zero whenever the real rate is held constant. Thus, the first partial derivative of the TIPS bond pricing formula with respect to expected inflation is zero and the first partial derivative of the TIPS bond price with respect to nominal rates is also zero, given, in each case, that we hold the real rate constant. We then temporarily shift the analysis to zero‐coupon TIPS bonds and zero‐coupon ordinary Treasury bonds. We prove that the nominal duration of zero‐coupon TIPS bonds equals that of zero‐coupon ordinary Treasury bonds when the real rate changes but expected inflation is held constant. However, if expected inflation changes and the change in the nominal rate does not yield a constant real rate, zero‐coupon TIPS prices will change and they will change by a smaller percentage than will zero‐coupon ordinary Treasury bonds. We analyze TIPS responsiveness to changes in nominal rates under such conditions. We derive an approximation to effective duration that demonstrates that the effective durations of various maturity zero‐coupon TIPS bonds are approximately linear functions in time to maturity of the effective duration of the one‐year zero‐coupon TIPS bond, ceteris paribus. Nominal effective duration of TIPS bonds is certainly of interest to fixed income portfolio managers that might have a desire to include such bonds in their portfolio. After all, the greater portion of a typical fixed income portfolio is in traditional, noninflation protected bonds whose major risk exposure is to changes in nominal rates. To properly assess the role of TIPS bonds in the portfolio, portfolio managers need information as to how TIPS bonds respond to the changes in nominal rates that are driving the price behavior of the bulk of the portfolio's assets. Prior to concluding the paper, we demonstrate how portfolio managers can calculate the nominal durations of coupon TIPS bonds using the zero‐coupon duration formula we derive.

Suggested Citation

  • Francis E. Laatsch & Daniel P. Klein, 2005. "The nominal duration of TIPS bonds," Review of Financial Economics, John Wiley & Sons, vol. 14(1), pages 47-60.
    • Handle: RePEc:wly:revfec:v:14:y:2005:i:1:p:47-60
    DOI: 10.1016/j.rfe.2004.06.001
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    References listed on IDEAS

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    1. Fama, Eugene F, 1975. "Short-Term Interest Rates as Predictors of Inflation," American Economic Review, American Economic Association, vol. 65(3), pages 269-282, June.
    2. Agathe Côté & Jocelyn Jacob & John Nelmes & Miles Whittingham, 1996. "Inflation expectations and Real Return Bonds," Bank of Canada Review, Bank of Canada, vol. 1996(Summer), pages 41-53.
    3. Darby, Michael R, 1975. "The Financial and Tax Effects of Monetary Policy on Interest Rates," Economic Inquiry, Western Economic Association International, vol. 13(2), pages 266-276, June.
    4. Kandel, Shmuel & Ofer, Aharon R & Sarig, Oded, 1996. "Real Interest Rates and Inflation: An Ex-Ante Empirical Analysis," Journal of Finance, American Finance Association, vol. 51(1), pages 205-225, March.
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