Conflict is a major cause of poverty in the developing world today. In addition to endangering lives, conflict disrupts the functioning of an economy in many ways. It destroys infrastructure, prevents children from going to school, and closes factories. A little-studied economic impact is conflict’s tendency to restrict the mobility of goods and labor within and across borders. These restrictions are caused both by insecurity associated with the conflict and by explicit barriers that constrain the mobility of people and goods. Our recent World Bank study measures the harm such barriers have caused the economy of the West Bank by limiting mobility in the Israeli-Palestinian conflict.