The gravity model of trade states that the volume of trade between two countries is proportional to the product of the sizes of the two countries and the inverse of the distance between them. The gravity model, however, was initially suggested for other types of social interactions, and it also...

Natural resources, and diamonds especially, are commonly believed to play a significant role in the onset and duration of armed civil conflict. Although there is ample case study evidence that diamonds and similar resources have been used by rebel groups to finance fighting, there are few...

Conflict appears more often between neighboring states. Adjacency generates interaction opportunities and arguably more willingness to fight. We revisit the nature of the border issue and measure geographical features likely to affect states’ interaction opportunities as well as their...

Geographical factors in general and proximity in particular have a pervasive influence on negative as well as positive interaction between states. Traditionally, proximity has been measured by contiguity or by great-circle distance. We argue that it is important to distinguish between the...

Most quantitative assessments of civil conflict draw on annual country-level data to determine a baseline hazard of conflict onset. The first problem with such analyses is that they ignore factors associated with the precipitation of violence, such as elections and natural disasters and other...