  A decision maker (DM) has some funds invested through two investment firms.
She wishes to allocate additional funds according to the firms' earnings. The
DM, on the one hand, tries to maximize the total expected earnings, while the
firms, on the other hand, try to maximize the overall expected funds they
manage. In this paper we prove that, for every market, the DM has an optimal
bonus policy such that the firms are motivated to act according to the
interests of the DM. On the other hand, we also prove that the only policy that
is optimal in every market, is independent of the actions and earnings of the
firms.
