This paper studies how the strength of social ties is affected by the geographical location of other individuals and their social capital. We characterize the equilibrium in terms of both social interactions and social capital. We show that lower travel costs increase not only the interaction...

The authors offer a general analytical framework illustrating the complex two-way interactions between trade and transnational terrorism. Then they survey the recent economic literature in light of this framework by pointing to the importance in empirical studies of (1) controlling appropriately...

What is the impact of terrorism on trade through higher security at the borders? The authors set up a theory which shows that the impact goes not only from terrorism to trade. Higher trade with a partner might, in turn, increase the probability of terrorism acts and make security measures more...

In order to elucidate the revival of religion in the Muslim countries, we must not only understand the spread of puritan interpretations of the faith (as they have permeated movements running from Muslim Brothers to violent Islamist movements), but also comprehend the process whereby these more...