We find that a small set of financial columnists has a causal effect on short-term aggregate stock market prices. For some journalists ("bulls") the market reaction is consistently positive, whereas for others ("bears") it is negative. Because bulls and bears are rotated exogenously in our...

We use the daily internet search volume from millions of households to reveal market-level sentiment. By aggregating the volume of queries related to household concerns (e.g. "recession", "unemployment" and "bankruptcy"), we construct a Financial and Economic Attitudes Revealed by Search (FEARS)...

Baseball cards exhibit anomalies that are analogous to those that have been documented in financial markets, namely, momentum, price drift in the direction of past fundamental performance, and IPO underperformance. Momentum profits are higher among active players than retired players, and among...

Using a sample of 97 stock return anomalies, we find that anomaly returns are 50% higher on corporate news days and are 6 times higher on earnings announcement days. These results could be explained by dynamic risk, mispricing via biased expectations, and data mining. We develop and conduct...

Short sellers face unique risks, such as the risk that stock loans become expensive and the risk that stock loans are recalled. We show that short-selling risk affects prices among the cross-section of stocks. Stocks with more short-selling risk have lower returns, less price efficiency, and...

We document lead-lag effects in stock returns between co-headquartered firms operating in different sectors. Such geographic lead-lags yield risk-adjusted returns of 5-6% per year, about half that observed for industry lead-lag effects. However, while industry lead-lag effects are strongest...