In this study, we use geographic proximity as a measure of private information and examine the informational role of social media in stock markets. Using a large sample of individual messages (tweets) collected from Twitter during the period July 2011–March 2012, we find that local Twitter...

Stock return comovement analysis is important to financial analysts, decision makers, and academic researchers, in many financial implications, such as, portfolio management, style investing, and market risk detecting. This paper examines firms' social media, in particular, microblogging...

This paper shows the importance of technological synergies among heterogeneous firms for aggregate fluctuations. First, we document six novel empirical facts using microdata that suggest the existence of important technological synergies between trading firms, the presence of positive...

We study how professional fund managers' growth expectations affect the actions they take with respect to equity investment and in turn the effects on prices. Using novel data on China's mutual fund managers' growth expectations, we show that pessimistic managers decrease equity allocations and...