On an Investment-Consumption Model With Transaction Costs

  • Authors:
  • Marianne Akian;Jose Luis Menaldi;Agnes Sulem

  • Affiliations:
  • -;-;-

  • Venue:
  • SIAM Journal on Control and Optimization
  • Year:
  • 1996

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Abstract

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 $n=2$.