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The holy grail of academic finance is to identify those factors that are best able to explain expected returns. The capital asset pricing model (CAPM) proposed by Sharpe (1964) and Lintner (1965) sought to calculate the risk premia inherent to financial assets. Researchers correspondingly study a variety of risk factors to best explain and predict the expected returns, including works by Fama and French (2016, 2018), and Barillas and Shanken (2018) among many others. In addition to company fundamentals and the macroeconomic environment, a new branch of finance has emerged for forecasting expected returns based on investor sentiment as one of the main drivers inducing return co-movements. Optimism or pessimism may drive investor behaviors that condition their interactions with the markets and therefore impacting on stock returns. This investor sentiment can derive from their belief or otherwise in the future...
References
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Reis, P.M.N., Pinto, A.P.S. (2021). Behavioral Finance. In: Idowu, S., Schmidpeter, R., Capaldi, N., Zu, L., Del Baldo, M., Abreu, R. (eds) Encyclopedia of Sustainable Management. Springer, Cham. https://doi.org/10.1007/978-3-030-02006-4_985-1
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