Nonrecursive separation of risk and time preferences

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Recursive utility disentangles preferences with respect to time and risk by recursively building up a value function of local increments. This involves certainty equivalents of indirect utility. Instead we disentangle preferences with respect to time and risk by building up a value function as a non-linear aggregation of certainty equivalents of direct utility of consumption. This entails time-consistency issues which are dealt with by looking for an equilibrium control and an equilibrium value function rather than a classical optimal control and a classical optimal value function. We characterize the solution in a general diffusive incomplete market model and find that, in certain special cases of utmost interest, the characterization coincides with what would arise from a recursive utility approach. But also importantly, in other cases, it does not: The two approaches are fundamentally different but match, exclusively but importantly, in the mathematically special case of homogeneity of the value function.

Original languageEnglish
JournalJournal of Mathematical Economics
Volume90
Pages (from-to)95-108
ISSN0304-4068
DOIs
Publication statusPublished - 2020

    Research areas

  • Certainty equivalents, Equilibrium strategies, Generalized Hamilton–Jacobi–Bellman equation, Recursive utility, Time-consistency, Time-global preferences

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