Transaction fees and optimal rebalancing in the growth-optimal portfolio

Details Transaction fees and optimal rebalancing in the growth-optimal portfolio Transaction fees and optimal rebalancing in the growth-optimal portfolio

2010-09-20

arxiv.org/abs/1009.3753v2

Physica A 390, 1635-1645 (2011)

Economy

Quantitative Finance

Portfolio Management

17 pages, 7 figures

Scientific paper

10.1016/j.physa.2010.12.031

The growth-optimal portfolio optimization strategy pioneered by Kelly is based on constant portfolio rebalancing which makes it sensitive to transaction fees. We examine the effect of fees on an example of a risky asset with a binary return distribution and show that the fees may give rise to an optimal period of portfolio rebalancing. The optimal period is found analytically in the case of lognormal returns. This result is consequently generalized and numerically verified for broad return distributions and returns generated by a GARCH process. Finally we study the case when investment is rebalanced only partially and show that this strategy can improve the investment long-term growth rate more than optimization of the rebalancing period.

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