We focus on the role of social media as a high-frequency, unfiltered mass information transmission channel and how its use for government communication affects the aggregate stock markets. To measure this effect, we concentrate on one of the most prominent Twitter users, the 45th President of...

Previous research in finance has found evidences of both overreaction and underreaction to unanticipated events, but has yet to explain why investors overreact to certain events while underreacting to others. In this paper, we hypothesize that while market participants generally underreact to...

We document that the emergence of markets for single-name credit default swap (CDS) contracts adversely affects equity market quality. The finding that firms with traded CDS contracts on their debt have less liquid equity and less efficient stock prices is robust across a variety of market...

IPO firms' rivals tend to experience performance declines following an IPO in the industry. Why? We estimate a dynamic structural oligopoly model to distinguish among alternative theories that can explain an industry's evolution post-IPO. We find that most changes in rivals' performance are due...