The World Trade Center attack has shed light on the urgent need to implement preventing measures against terrorism and to enhance cooperation in the global security system for all countries. However, international coordination cannot be taken for granted. It is often ineffective and likely to...

We study the impact of transnational terrorism diffusion on security and trade. We set a simple theoretical model predicting that the closer a country to a source of terrorism, the higher the negative spillovers on its trade. The idea is that security measures, which impede trade, are directed...