DUALITY IN OPTIMAL INVESTMENT AND CONSUMPTION PROBLEMS WITH MARKET FRICTIONS |
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Authors: | I Klein L C G Rogers |
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Institution: | Department of Statistics and Decision Support Systems, University of Vienna, Vienna, Austria; Statistical Laboratory, Cambridge, UK |
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Abstract: | In the style of Rogers (2001) , we give a unified method for finding the dual problem in a given model by stating the problem as an unconstrained Lagrangian problem. In a theoretical part we prove our main theorem, Theorem 3.1, which shows that under a number of conditions the value of the dual and primal problems is equal. The theoretical setting is sufficiently general to be applied to a large number of examples including models with transaction costs, such as Cvitanic and Karatzas (1996) (which could not be covered by the setting in Rogers 2001] ). To apply the general result one has to verify the assumptions of Theorem 3.1 for each concrete example. We show how the method applies for two examples, first Cuoco and Liu (1992) and second Cvitanic and Karatzas (1996) . |
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Keywords: | utility maximization optimal investment and consumption market frictions convex duality Lagrangian semimartingale |
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