Rationally justifying Bitcoin's immense price fluctuations has remained a persistent challenge for both investors and researchers in this field. A primary reason is our potential weakness toward robustly quantifying unquantifiable risks or ambiguity in Bitcoin returns. This paper introduces a...

Shareholder litigation risk, measured using the staggered adoption of universal demand (UD) laws in 23 states from 1989 to 2005, has a negative effect on stock returns. Using a difference-in-differences design, we find that, following the passage of the laws, firms have lower stock returns....

The impact of sentiment on asset prices varies during periods of low and high ambiguity and risk and across countries. Examining stock market returns across twenty-nine countries, we show that the predictability of sentiment is more pronounced when ambiguity is low in Australia, Canada, Czech...

This study assesses whether the widely documented momentum profits can be attributed to time-varying risk as described by a GJR-GARCH(1,1)-M model. We reveal that momentum profits are a compensation for time-varying unsystematic risks, which are common to the winner and loser stocks but affect...

This paper examines whether the negative relation between idiosyncratic volatility and expected returns is due to stock return reversals as argued by Fu (2009) and Huang, Liu, Rhee and Zhang (2010). Controlling the return reversal effect, it shows that stocks with different past returns have...