London Business School
26 Sussex plc, Regent's Park
NW1 4SA London
NBER Working Papers and Publications
|November 2017||Firm-Level Political Risk: Measurement and Effects|
with Tarek A. Hassan, Stephan Hollander, Laurence van Lent: w24029
We adapt simple tools from computational linguistics to construct a new measure of political risk faced by individual US firms: the share of their quarterly earnings conference calls that they devote to political risks. We validate our measure by showing it correctly identifies calls containing extensive conversations on risks that are political in nature, that it varies intuitively over time and across sectors, and that it correlates with the firm’s actions and stock market volatility in a manner that is highly indicative of political risk. Firms exposed to political risk retrench hiring and investment and actively lobby and donate to politicians. Interestingly, the vast majority of the variation in our measure is at the firm level rather than at the aggregate or sector level, in the sens...
|November 2014||The Power of the Street: Evidence from Egypt's Arab Spring|
with Daron Acemoglu, Tarek A. Hassan: w20665
During Egypt's Arab Spring, unprecedented popular mobilization and protests brought down Hosni Mubarak's government and ushered in an era of competition between three groups: elites associated with Mubarak's National Democratic Party (NDP), the military, and the Islamist Muslim Brotherhood. Street protests continued to play an important role during this power struggle. We show that these protests are associated with differential stock market returns for firms connected to the three groups. Using daily variation in the number of protesters, we document that more intense protests in Tahrir Square are associated with lower stock market valuations for firms connected to the group currently in power relative to non-connected firms, but have no impact on the relative valuations of firms connecte...
Published: Daron Acemoglu & Tarek A. Hassan & Ahmed Tahoun, 2018. "The Power of the Street: Evidence from Egypt’s Arab Spring," The Review of Financial Studies, vol 31(1), pages 1-42.