An Analysis of Terror Warnings
28 Pages Posted: 19 Jan 2005
Date Written: July 18, 2005
Abstract
Two important defensive mechanisms available to governments combating terrorism are warnings and the deployment of physical resources. Warnings are relatively inexpensive to issue but their effectiveness suffers from false alarms. Physical deployments of trained security personnel can directly thwart attacks but are expensive and need to be targeted to specific locations. In this paper we model the joint optimization of defenses against terrorist attacks based on warnings and physical deployments. We model both private warnings issued to security forces and public warnings broadcast to the general public. By structuring the tradeoffs faced by decision makers in a formal way we shed light on an important public policy problem. We show that the interaction between the use of warnings and physical defenses is complex, significant, and leads to strategies that are seemingly counterintuitive. For public warnings we also model the possible response of terrorists and show how these responses influence the effectiveness of such warnings.
Keywords: Terrorism, Public Policy, Warning Systems
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