Journal
APPLIED MATHEMATICS AND OPTIMIZATION
Volume 42, Issue 1, Pages 19-33Publisher
SPRINGER VERLAG
DOI: 10.1007/s002450010003
Keywords
continuous time; mean-variance; portfolio; efficient frontier; linear-quadratic control
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This paper is concerned with a continuous-time mean-variance portfolio selection model that is formulated as a bicriteria optimization problem. The objective is to maximize the expected terminal return and minimize the variance of the terminal wealth. By putting weights on the two criteria one obtains a single objective stochastic control problem which is however not in the standard form due to the variance term involved. It is shown that this nonstandard problem can be embedded into a class of auxiliary stochastic linear-quadratic (LQ) problems. The stochastic LQ control model proves to be an appropriate and effective framework to study the mean-variance problem in light of the recent development on general stochastic LQ problems with indefinite control weighting matrices. This gives rise to the efficient frontier in a closed form for the original portfolio selection problem.
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