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Dollar Cost Averaging Returns Estimation

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  • Hayden Brown

Abstract

Given a geometric Brownian motion wealth process, a log-Normal lower bound is constructed for the returns of a regular investing schedule. The distribution parameters of this bound are computed recursively. For dollar cost averaging (equal amounts in equal time intervals), parameters are computed in closed form. A lump sum (single amount at time 0) investing schedule is described which achieves a terminal wealth distribution that matches the wealth distribution indicated by the lower bound. Results are applied to annual returns of the S&P Composite Index from the last 150 years. Among data analysis results, the probability of negative returns is less than 2.5% when annual dollar cost averaging lasts over 40 years.

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  • Hayden Brown, 2021. "Dollar Cost Averaging Returns Estimation," Papers 2112.09807, arXiv.org.
    • Handle: RePEc:arx:papers:2112.09807
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    File URL: http://arxiv.org/pdf/2112.09807
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