A plan of action and emergency supplies can prove invaluable when disaster strikes. Adequate response might take several days or even weeks, so individuals who identify and prepare for disaster are at a marked advantage. So too are locations with established and practiced disaster plans at an advantage, resulting in saved lives and saved financial resources. The United Nations estimates that every one dollar invested in preparedness strategies saves seven dollars in post-disaster rebuilding and reconstruction costs. Still, advocates of increased disaster preparedness say that national leaders in developing countries are slow to prioritize preventive measures, given their budgetary and infrastructural constraints.