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Duration Concepts, Analysis, and Applications

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Encyclopedia of Finance
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Abstract

We discuss duration and its development, placing particular emphasis on various applications. The survey begins by introducing duration and showing how traders and portfolio managers use this measure in speculative and hedging strategies. We then turn to convexity, a complication arising from relaxing the linearity assumption in duration. Next, we present immunization – a hedging strategy based on duration – and then examine stochastic process risk, foreign-exchange risk, and duration extensions that address these risks. We also examine the track record of duration and how the measure applies to financial futures. The discussion then turns to macrohedging the entire balance sheet of a financial institution. We develop a theoretical framework for duration gaps and apply it, in turn, to banks, life insurance companies, and defined benefit pension plans.

For The Encyclopedia of Finance, C.F. Lee, editor, Third Edition, Kluwer Academic Publishers.

Gordon Roberts: deceased.

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Notes

  1. 1.

    Bierwag (1977, 1987a) provide excellent reviews of duration analysis.

  2. 2.

    For more on market risk see J.P. Morgan (1994) and Cornett and Saunders (2008), Chap. 9.

  3. 3.

    This discussion of immunization begins by assuming default and option free securities in order to separate interest rate risk from other risks.

  4. 4.

    Bierwag and Kaufman (1977) maintain that, for the duration matched portfolios, these two effects (unexpected gains and losses resulting from interest rate shifts) cancel each other out, unless the stochastic process is not consistent with the equilibrium conditions, in which case the unexpected gain will be greater than the unexpected loss.

  5. 5.

    For more details on contingent immunization, see Bierwag (1987a) and Leibowitz and Weinberger (1981, 1982, 1983).

  6. 6.

    Detailed discussion of these modelling issues is in Bierwag (1977, 1987a).

  7. 7.

    For simplicity, the derivation assumes away any difference between rates of return for assets and liabilities, rA and rL. This may not be strictly true because interest earned on assets is higher than interest paid on liabilities. However, the essence of the argument is not affected by this assumption. In practice, duration gap implementation uses the average of the rates on assets and liabilities.

  8. 8.

    Following prior research, we choose the change in the market value of equity (E) as the target because maximizing equity value is most likely to be the goal of management and shareholders. Another possible target is E/A (the capital ratio) particularly in the case in which E/A is at the regulatory minimum of 8% and management wishes to immunize against any fall in the ratio. In practice, a financial institution likely targets equity along with other variables. Further discussion of this issue is in Kaufman (1984) and Bierwag and Kaufman (1996).

  9. 9.

    Some readers may be familiar with the concept of funding gap. Funding gap is defined as rate sensitive assets minus rate-sensitive liabilities. It differs from duration gap in two fundamental respects. First, funding gap relates interest rate shifts to the book value of net income; duration gap relates rate shifts to the market value of equity. Second, funding gap ignores the repricing of long-term assets when rates change. Because of these differences, a positive funding gap corresponds to a negative duration gap.

  10. 10.

    More generally, academic research supports the view that FI shares move in the direction expected by the theory of duration gaps. For an example, see Flannery and James (1984).

  11. 11.

    Early researchers on duration (Macaulay 1938; Redington 1952, for example) were actuaries who published their results in actuarial journals.

  12. 12.

    According to the U.S. Bureau of Labor Statistics, in 2019 only 16% of private-sector employees were enrolled in a defined benefit plan (see: www.bls.gov/ncs/ebs/factsheet/defined-benefit-frozen-plans.pdf)

  13. 13.

    In case of deflation, the principal amount cannot be indexed to a level lower than its unadjusted principal.

  14. 14.

    Note that the inflation-indexation schemes will affect an instrument’s value and elasticity. Fooladi et al. (2021) demonstrate that, when imperfect indexation implies under (over) protection against inflation, the instrument will have a positive (negative) expected-inflation duration, and its value will be negatively (positively) affected by inflation.

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Acknowledgments

The authors gratefully acknowledge the support of the Social Sciences and Humanities Research Council of Canada. In addition, Iraj Fooladi received support from the Douglas C. Mackay Fund at Dalhousie.

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Afik, Z., Fooladi, I., Jacoby, G., Roberts, G. (2022). Duration Concepts, Analysis, and Applications. In: Lee, CF., Lee, A.C. (eds) Encyclopedia of Finance. Springer, Cham. https://doi.org/10.1007/978-3-030-91231-4_14

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