Geometric Mean Return is a method for estimating return over multiple time periods. The geometric mean considers the effect of compounding. The process in which an asset’s earnings from one period can be reinvested to generate more earnings over subsequent periods.
Some other related topics you might be interested to explore are Arithmetic Mean and Holding Period Return.
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Geometric Mean Return is among the topics included in the Portfolio Management module of the CFA Level 1 Curriculum.
