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Dynamic Option Adjusted Spread and the Value of Mortgage Backed Securities (Draft 1)

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  • Cerrato, Mario
  • Djennad, Abdelmadjid

Abstract

We extend a reduced form model for pricing pass-through mortgage backed securities (MBS) and provide a novel hedging tool for investors in this market. To calculate the price of an MBS, traders use what is known as option-adjusted spread (OAS). The resulting OAS value represents the required basis points adjustment to reference curve discounting rates needed to match an observed market price. The OAS suffers from some drawbacks. For example, it remains constant until the maturity of the bond (thirty years in mortgage-backed securities), and does not incorporate interest rate volatility. We suggest instead what we call dynamic option adjusted spread (DOAS). The latter allows investors in the mortgage market to account for both prepayment risk and changes of the yield curve.

Suggested Citation

  • Cerrato, Mario & Djennad, Abdelmadjid, 2008. "Dynamic Option Adjusted Spread and the Value of Mortgage Backed Securities (Draft 1)," SIRE Discussion Papers 2008-02, Scottish Institute for Research in Economics (SIRE).
    • Handle: RePEc:edn:sirdps:15
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    File URL: http://hdl.handle.net/10943/15
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    References listed on IDEAS

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    1. Hull, John & White, Alan, 1993. "One-Factor Interest-Rate Models and the Valuation of Interest-Rate Derivative Securities," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 28(2), pages 235-254, June.
    2. Schwartz, Eduardo S & Torous, Walter N, 1992. "Prepayment, Default, and the Valuation of Mortgage Pass-through Securities," The Journal of Business, University of Chicago Press, vol. 65(2), pages 221-239, April.
    3. David Heath & Robert Jarrow & Andrew Morton, 2008. "Bond Pricing And The Term Structure Of Interest Rates: A New Methodology For Contingent Claims Valuation," World Scientific Book Chapters, in: Financial Derivatives Pricing Selected Works of Robert Jarrow, chapter 13, pages 277-305, World Scientific Publishing Co. Pte. Ltd..
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