The Optimal Time to Exchange one Asset for Another on Finite Interval



Let \(S^{1}_{t}\), \(S_{t}^{2}\) be correlated geometric Brownian motions. We consider the following problem: find the stopping time τ*T such that
where the supremum is taken over all stopping times from [0,T]. A similar problem, but on infinite interval, was studied by MacDonald and Siegel (Int. Econ. Rev. 26:331–349, 1985), and by Hu and Oksendal (Finance Stoch. 2(3):295–310, 1998), who also considered multiple assets. For a finite time horizon, the problem gets considerably more complicated and cannot be solved explicitly. In this paper we study generic properties of the optimal stopping set and its boundary curve, and derive an integral equation for the latter.


Optimal stopping Geometric Brownian motion Finite horizon Free boundary problem 

Mathematics Subject Classification (2000)

60G40 60J65 35R35 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Kyiv National Taras Shevchenko UniversityKyivUkraine

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