Brutality is the defining characteristic of terrorism. It is despairing to learn that this brutality is the outcome of purposeful, rational, human behaviour. In this purposefulness, however, there lies the key to the interpretation, explanation and understanding of terrorist behaviour. Ultimately, it is in this purposefulness that we shall also find the key to overcoming terrorism. Economic analysis highlights this purposefulness, this rationality, and in doing so provides a different perspective from which to approach the threat of terrorism and the task of pre-empting and pursuing its...