This paper documents that in Sub-Saharan Africa areas isolated from the capital city are less economically developed and examines potential underlying mechanisms. We apply a boundary-discontinuity design using national borders that divide pre-colonial ethnic homelands to obtain...

This paper estimates the link between population density and COVID-19 spread and severity in the contiguous United States. To overcome confounding factors, we use two Instrumental Variable (IV) strategies that exploit geological features and historical populations to induce exogenous variation...

Recent research suggests that short-term exposure to air pollution is associated with an elevated prevalence of respiratory infectious disease. We examine the relationship between the air quality index (AQI) and weekly cases of influenza-like illnesses (ILI) and COVID-19 in the United States. We...