Optimal portfolio selection with consumption and nonlinear integro-differential equations with gradient constraint: A viscosity solution approach

Kristin Reikvam, Fred Espen Benth and Kenneth Hvistendahl Karlsen
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Kristin Reikvam: Department of Mathematics, University of Oslo, P. O. Box 1053, Blindern, N-0316 Oslo, Norway Manuscript
Fred Espen Benth: Department of Mathematics, University of Oslo, P. O. Box 1053, Blindern, N-0316 Oslo, Norway
Kenneth Hvistendahl Karlsen: Department of Mathematics, University of Bergen, Johs. Brunsgt. 12, N-5008 Bergen, Norway

Finance and Stochastics, 2001, vol. 5, issue 3, 275-303

Abstract: We study a problem of optimal consumption and portfolio selection in a market where the logreturns of the uncertain assets are not necessarily normally distributed. The natural models then involve pure-jump Lévy processes as driving noise instead of Brownian motion like in the Black and Scholes model. The state constrained optimization problem involves the notion of local substitution and is of singular type. The associated Hamilton-Jacobi-Bellman equation is a nonlinear first order integro-differential equation subject to gradient and state constraints. We characterize the value function of the singular stochastic control problem as the unique constrained viscosity solution of the associated Hamilton-Jacobi-Bellman equation. This characterization is obtained in two main steps. First, we prove that the value function is a constrained viscosity solution of an integro-differential variational inequality. Second, to ensure that the characterization of the value function is unique, we prove a new comparison (uniqueness) result for the state constraint problem for a class of integro-differential variational inequalities. In the case of HARA utility, it is possible to determine an explicit solution of our portfolio-consumption problem when the Lévy process posseses only negative jumps. This is, however, the topic of a companion paper [7].

Keywords: Portfolio choice; intertemporal utility; stochastic control; singular control; dynamic programming; integro-differential variational inequality; state constraint problem; viscosity solution; comparison result (search for similar items in EconPapers)
JEL-codes: C61 D91 G11 (search for similar items in EconPapers)
Date: 2001-07-12
Note: received: July 1999; final version received: April 2000
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Citations: View citations in EconPapers (20)

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