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Jun 6, 2016 at 2:52 comment added Stephan Sturm Indeed $a$ is just doing some reallocation, but for that only $\int_0^T a(s) \, ds$ matters. However this might not be chosen arbitrarily, but might depend on the constraints you have. To understand the problem better, could you provide some economic motivation? In particular, are $X_1$ and $X_2$ to be assumed always nonnegative? And more general it would be interesting to understand why you have two different utility functions for the different processes which are nevertheless additive.
Jun 4, 2016 at 13:34 comment added Mark I guess an optimal control $a$ might be to "reallocate" between processes $X_{1}$ and $X_{2}$, such that the resulting change in terminal utility is maximized, i.e. $a(t)=U_{1}^{'}\big(X_{1}(t)\big) - U_{2}^{'}\big(X_{2}(t)\big)$.
Jun 4, 2016 at 13:27 history edited Mark CC BY-SA 3.0
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Jun 1, 2016 at 14:31 history asked Mark CC BY-SA 3.0