Date of Original Version
The final publication is available at Springer via http://dx.doi.org/10.1007/s00780-015-0268-9
Abstract or Description
In the setting of exponential investors and uncertainty governed by Brownian motions, we first prove the existence of an incomplete equilibrium for a general class of models. We then introduce a tractable class of exponential–quadratic models and prove that the corresponding incomplete equilibrium is characterized by a coupled set of Riccati equations. Finally, we prove that these exponential–quadratic models can be used to approximate the incomplete models we studied in the first part.
Finance and Stochastics, 19, 3, 653-679.