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Utility maximization with partial information. (English) Zbl 0834.90022
Summary: We address two maximization problems: the maximization of expected total utility from consumption and the maximization of expected utility from terminal wealth. The price process of the available financial assets is assumed to satisfy a system of functional stochastic differential equations. The difference between this paper and the existing papers on the same subject is that here we require the consumption and investment processes to be adapted to the natural filtration of the price processes. This requirement means that the only available information for agents in this economy at a certain time are the prices of the financial assets up to that time. The underlying Brownian motion and the drift process in the system of equations for the asset prices are not directly observable. Particular details will be worked out for the “Bayesian” example, when the dispersion coefficient is a fixed invertible matrix and the drift vector is an F 0 -measurable, unobserved random variable with known distribution.
MSC:
91B16Utility theory
60H10Stochastic ordinary differential equations