In a continuous-time framework, the issue of how to delegate an investor's portfolio decision to a portfolio manager is studied. First, we solve the first-best problem. For the second-best case, a specific quadratic contract is introduced resolving the agency conflict completely in the sense...

In a continuous-time framework, the issue of how to delegate an investor's portfolio decision to a portfolio manager is studied. Firstly, we solve the first-best problem where the investor is able to force the manager to implement a certain strategy. For the second-best case, a specific...

Credit risk is an important issue of current research in finance. While there is a lot of work on modelling credit risk and on valuing credit derivatives there is no work on continuous-time portfolio optimization with defaultable securities. Therefore, in this paper we solve investment problems...

Credit risk is an important issue of current research in finance. While there is a lot of work on modelling credit risk and on valuing credit derivatives there is no work on continuous-time portfolio optimization with defaultable securities. Therefore, in this paper we solve investment problems...

We consider the problem of L2-hedging of contingent claims in diffusion type models for securities markets. In contrast to a recent paper of Schweizer (1994) we insist on a non-negative wealth process corresponding to the optimal hedge portfolio. For this reason the usual projection methods...