Management Strategies for a Defined Contribution Pension Fund under the Hull-White Interest Rate Model

摘要

This paper analyzes optimal investment strategies for a DC pension fund under the Hull-White interest rate model. Under this model, the pension fund manager can invest capital in the bank account, stock index, and real estates. The dynamics of the interest rate follows the Hull-White interest rate model, and a drifted Brownian motion drives the financial market. The pension fund manager aims to maximize the expected terminal utility of wealth in a complete market setting under constant relative risk aversion (CRRA). This paper derives the Hamilton-Jacobi-Bellman (HJB) equation associated with the control problem using a dynamic programming technique. We obtain the explicit solution for optimal investment policies by solving the HJB equation and optimal value function. The results show that the optimal proportion invested in risky assets is higher in stock than in a real estate.