 OPTION-BASED VALUATION OF MORTGAGE-BACKED SECURITIESAna Manola and Branko Uroševic Economic Annals, 2010, vol. 55, issue 186, 42–66 Abstract: Pure econometric approaches to pricing mortgage-backed securities (MBSs) - principal pricing vehicles used by financial practitioners - fail to capture their true risks. This point was powerfully driven home by the global financial crisis. Since prior to the crisis default rates of MBSs were quite modest, econometric pricing models systematically underestimated the possibility of default. As a result, MBSs were severely overvalued. It is widely believed that the global crisis was largely triggered by incorrect valuation of mortgage-backed securities. In the aftermath, it is important to revisit the foundations for pricing MBSs and to pay much closer attention to default risk. This paper introduces a comprehensive model for valuation of fixed-rate pass-through mortgagebacked securities in a simple option-based framework. In the model, we use bivariate binomial tree approach to simultaneously model prepayment and default options. Our simulation results demonstrate that the proposed model has sufficient flexibility to capture the two principal risks. Keywords: mortgage-backed security (MBS); prepayment; default; bivariate binomial pricing technique (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:beo:journl:v:55:y:2010:i:186:p:42-66 Ordering information: This journal article can be ordered from Access Statistics for this article Economic Annals is currently edited by Will Bartlett More articles in Economic Annals from Faculty of Economics and Business, University of Belgrade Contact information at EDIRC. |
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