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- W3125016830 abstract "It is a big mistake to use betas calculated from historical data to compute the required return to equity. It is a mistake for seven reasons: because betas calculated from historical data change considerably from one day to the next; because calculated betas depend very much on which stock index is used as the market reference; because calculated betas depend very much on which historical period is used to calculate them; because calculated betas depend on what returns (monthly, daily,…) are used to calculate them; because very often we do not know if the beta of one company is lower or higher than the beta of another; because calculated betas have little correlation with stock returns; and because the correlation coefficients of the regressions used to calculate the betas are very small. For these seven reasons we can say either that the beta calculated from historical data is not a good approximation to the company's beta, or that the CAPM does not work (the required return is affected by other factors, besides the covariance of the company's return with the market return, the risk-free rate and the market risk premium), or both things at once." @default.
- W3125016830 created "2021-02-01" @default.
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- W3125016830 date "2004-01-01" @default.
- W3125016830 modified "2023-09-24" @default.
- W3125016830 title "On the instability of betas: The case of Spain" @default.
- W3125016830 hasPublicationYear "2004" @default.
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