We identify all return leader-follower pairs among individual stocks using Granger causality regressions. Thus-identified leaders can reliably predict their followers' returns out of sample, and the return predictability works at the level of individual stocks rather than industries. Our results...

We show that news stories contain information about economic linkages between firms and document that information diffuses slowly across linked stocks. Specifically, we identify linked stocks from co-mentions in news stories and find that linked stocks cross-predict one another's returns in the...

We document that stocks that experience sudden increases in idiosyncratic volatility underperform otherwise similar stocks in the future, and we propose that this phenomenon can be explained by the Miller (1977) conjecture. We show that volatility shocks can be traced to the unusual firm-level...

We identify all return leader-follower pairs among individual stocks using Granger causality regressions. Thus-identified leaders reliably predict their followers' returns out of sample, and the return predictability works at the level of individual stocks rather than industries. Our results...

Though COVID vaccines are finally available, the rate at which they are administered is slow, and in the meantime the pandemic continues to claim about as many lives every day as the 9/11 tragedy. I estimate that with the promised rate of vaccinations, if no additional non-pharmaceutical...

Why do asset price bubbles continue to appear in various markets? This paper provides an overview of recent literature on bubbles, with significant attention given to behavioral models and rational models with frictions. Unlike the standard rational models, the new literature is able to model...

We compile a comprehensive dataset of adverse cyber events experienced by U.S. firms. We then categorize cyber incidents by their detrimental impacts on firms' assets and operations and show that firms suffer significant value losses across multiple cyber categories. These losses also spill over...

This paper shows that mutual funds tend to substantially alter their factor loadings following quarters in which they either under- or out-perform other funds based on returns or fund flows. These loadings changes are not mechanical but rather a result of deliberate trading decisions. We propose...