Determination of expected cost of equity with the CAPM: Theoretical extension using the law of error propagation

Mario Situm

Managerial and Decision Economics, 2021, vol. 42, issue 1, 77-84

Abstract: The determination of the expected return on equity based on the capital asset pricing model (CAPM) is an internationally recognized method, although the underlying theory is not without criticism and therefore leaves sufficient room for interpretation. Strictly speaking, the expected return on equity cannot be determined per se, as all parameters of the CAPM have to be estimated and contain measurement errors. The statistical measurement errors would have to be included in the calculation of the expected return on equity. The paper discusses the current view on how the expected return on equity is determined in the Germen‐speaking countries and presents an approach to transfer the measurement errors of the parameter risk‐free rate, market risk premium, and company beta to the calculated return on equity using the Gaussian law of error propagation.

Date: 2021
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https://doi.org/10.1002/mde.3214

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Persistent link: https://EconPapers.repec.org/RePEc:wly:mgtdec:v:42:y:2021:i:1:p:77-84

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