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Regime-switching affine term structures

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  • Andreas Celary
  • Zehra Eksi-Altay
  • Paul Krühner

Abstract

We consider an HJM model setting for Markov-chain modulated forward rates. The underlying Markov chain is assumed to induce regime switches on the forward curve dynamics. Our primary focus is on the interest rate and energy futures markets. After deriving HJM-drift conditions for the two markets, we prove under the assumption of affine structure for the term structure that the forward curves are solutions to specific systems of ODEs that can be solved explicitly in many cases. This allows for a tractable model setting, and we present an algorithm for obtaining consistent forward curve models within our framework. We conclude by presenting some numerical examples and an application to real data under a one-factor Gaussian model setting.

Suggested Citation

  • Andreas Celary & Zehra Eksi-Altay & Paul Krühner, 2023. "Regime-switching affine term structures," Quantitative Finance, Taylor & Francis Journals, vol. 24(1), pages 139-155, December.
    • Handle: RePEc:taf:quantf:v:24:y:2023:i:1:p:139-155
    DOI: 10.1080/14697688.2023.2288871
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