Abstract
Empirical studies have documented the influence of investor sentiment on financial markets, but the underlying economic mechanism remains unclear. This study links psychological research and a traditional asset-pricing model to investigate the influence of investor sentiment variations on financial markets. By relaxing the assumption of investor rationality, this investigation shows that a modified Lucas [1978] model can adequately interpret prominent financial market anomalies, such as high volatility, bubble and crash formation, and the relationships among investor sentiment, asset prices and expected returns.
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