A tale of two debt crises: a stochastic optimal control analysis

Jerome Stein

No 2009-44, Economics Discussion Papers from Kiel Institute for the World Economy (IfW Kiel)

Abstract: Banks should evaluate whether a borrower is likely to default. The author applies several techniques in the extensive mathematical literature of stochastic optimal control/dynamic programming to derive an optimal debt in an environment where there are risks on both the asset and liabilities sides. The vulnerability of the borrowing firm to shocks from either the return to capital, the interest rate or capital gain, increases in proportion to the difference between the Actual and Optimal debt ratio, called the excess debt. As the debt ratio exceeds the optimum, default becomes ever more likely. This paper is A Tale of Two Crises because the analysis is applied to the agricultural debt crisis of the 1980s and to the sub-prime mortgage crisis of 2007. A measure of excess debt is derived, and the author shows that it is an early warning signal of a crisis.

Keywords: Optimization; banking; stochastic optimal control; agriculture debt crisis; subprime mortgage crisis (search for similar items in EconPapers)
JEL-codes: C61 D81 D91 D92 (search for similar items in EconPapers)
Date: 2009
New Economics Papers: this item is included in nep-rmg and nep-ure
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http://www.economics-ejournal.org/economics/discussionpapers/2009-44
https://www.econstor.eu/bitstream/10419/28250/1/610368567.PDF (application/pdf)

Related works:
Journal Article: A tale of two debt crises: a stochastic optimal control analysis (2010)
Working Paper: A Tale of Two Debt Crises: A Stochastic Optimal Control Analysis (2008)
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Persistent link: https://EconPapers.repec.org/RePEc:zbw:ifwedp:200944

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