IMCAS'09 Proceedings of the 8th WSEAS international conference on Instrumentation, measurement, circuits and systems
Multigrid Techniques in Economics
Operations Research
Merton Problem with Taxes: Characterization, Computation, and Approximation
SIAM Journal on Financial Mathematics
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This paper considers the optimal consumption and investment policy for an investor who has available one bank account paying a fixed interest rate and $n$ risky assets whose prices are log-normal diffusions. We suppose that transactions between the assets incur a cost proportional to the size of the transaction. The problem is to maximize the total utility of consumption. Dynamic programming leads to a variational inequality for the value function. Existence and uniqueness of a viscosity solution are proved. The variational inequality is solved by using a numerical algorithm based on policies, iterations, and multigrid methods. Numerical results are displayed for $n=1$ and $n=2$.