When disaster strikes, it inevitably has an impact on urban economic systems, and more broadly, on national and international economies. Most cities are hubs of economic activity, and some are also important regional or even global financial centres. The scale of economic impact varies according to the spread, intensity and type of disaster, while the magnifying qualities of large urban economies, land markets and insurance policies also play a role, as highlighted in the UN-HABITAT report Enhancing Urban Safety and Security: Global Report on Human Settlements 2007.