This paper estimates time-varying COVID-19 reproduction numbers worldwide solely based on the number of reported infected cases, allowing for under-reporting. Estimation is based on a moment condition that can be derived from an agent-based stochastic network model of COVID-19 transmission. The...

We develop a theory of interstate conflict in which the degree of genealogical relatedness between populations has a positive effect on their conflict propensities because more closely related populations, on average, tend to interact more and develop more disputes over sets of common issues. We...

This paper has three goals. The first (and perhaps the most important one) is to provide a new compilation of data on ethnic, linguistic and religious composition at the sub-national level for a large number of countries. This data set allows us to measure segregation of different ethnic,...