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A martingale approach for asset allocation with derivative security and hidden economic risk

Published online by Cambridge University Press:  01 October 2019

Tak Kuen Siu*
Affiliation:
Macquarie University
Jinxia Zhu*
Affiliation:
The University of New South Wales
Hailiang Yang*
Affiliation:
The University of Hong Kong
*
*Postal address: Department of Actuarial Studies and Business Analytics, Macquarie Business School, Macquarie University, Sydney, NSW 2109, Australia.
***Postal address: School of Risk and Actuarial Studies, Business School, The University of New South Wales, Sydney, Australia.
****Postal address: Department of Statistics and Actuarial Science, The University of Hong Kong, Hong Kong, China.

Abstract

Asset allocation with a derivative security is studied in a hidden, Markovian regime-switching, economy using filtering theory and the martingale approach. A generalized delta-hedged ratio and a generalized elasticity of an option are introduced to accommodate the presence of the information state process and the derivative security. Malliavin calculus is applied to derive a solution for a general utility function which includes an exponential utility, a power utility, and a logarithmic utility. A compact solution is obtained for a logarithmic utility. Some economic implications of the solutions are discussed.

Type
Research Papers
Copyright
© Applied Probability Trust 2019 

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