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© 2019 Elsevier B.V. Conventional wisdom suggests that the uncertainty of uninformed noise-traders’ sentiment deters rational traders’ arbitrage activities. However, nowadays, social media have made the public sentiment highly predictable, whereas the CAPM-motivated beta-return relation still does not hold in practice.
Wei Hu, Zhenlong Zheng
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CAPM Failure & New CAPM Relationship
SSRN Electronic Journal, 2004The cost of equity is required (besides various other basic data) for many financial applications such as capital budgeting decisions and performance measurements. A common procedure is to use the Capital Asset Pricing Model (CAPM), which involves estimation of an expected risk premium equal to beta times the expected risk premium on the 'market ...
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